Is there an Orthodox patron saint of lonely and those feeling unwanted and unloved?
Question on saints
Here is some info that could help
List of Which Saints
Have Grace Given
of God for
What Kinds of Healing
and When Their 
Commemoration Occurs 
Compiled by Father Demetrios Serfes
(Editors notes: please kindly note that the date commemorating the Saint is first the new calendar, and then the old calendar date.)
Grace             Saint                     Date 
Recovery of sight to the blind
 Holy Mother of God of Kazan July 8/21 
The healing of sicknesses of the eyes Holy Martyr Menas the Egyptian Nov. 11/24 
 Holy Martyr Laurence the Arch-deacon Aug. 10/23 
 Holy Martyr Longinus the Centurion
 Oct. 16/29 
Healing of headaches
 St. John the Baptist Aug.29/Sept.11 
Deliverance from torment of those who died without repentance
 St. Paisius the Great July 19/Aug. 2 
Healing of tooth diseases
 Holy Hieromartyr Antipas April 11/24 
Learning to paint icons Holy Apostle Luke Oct. 18/31 
 Holy Apostle John the Theologian
 Sept. 26/Oct. 9 
Freedom from 
difficulties
in childbirth the Feodorovskaya Icon of the Most Holy Mother of God of Kostroma Aug.16/29 
 Holy Great-martyr Catherine
 Nov. 24/Dec. 7 
If a husband comes to hate a wife without cause
 Holy Prophet Elias July 20/Aug. 2 
The deliverance of a child from birth marks
 The Great-martyr Nicetas Sept 15/28 
The healing of children with smallpox
 The Martyr Conon March 5/18 
Protection from fire and lightning Holy Mother of God
of the Unburnt Bush Sept. 4/17 
 St. Nikita (Nicetas)
of Novgorod
 Jan31/Feb13 
Healing of trembling St. Maron Feb 14/27 
or shaking diseases St. Photina the
Samaritan woman  Mar20/April2 
 St. Basil the New
 Mar26/April 8 
Healing of hernias
 St.Artemius Oct. 20/Nov. 2 
Solution to the problem St. Roman the Wonderworker Nov. 27/Dec. 10 
of barrenness and childlessness St. Hypatius, abbot of Rufinus
 Mar31/April13 
Deliverance from floods, and other calamities and sorrows
 St. Nicholas the Wonderworker Dec. 6/19 
Deliverance from cattle plague St. Modestus  Dec. 18/31 
 St. Blaise the Hieromartyr
 Feb. 11/24 
Preservation of the health of infants  Icon of the Tikhvin Mother of God  June 26/July 8 
 Righteous Symeon the God-receiver 
 Feb. 3/16  
Protection from sudden death  Hieromartyr Sadoc Oct.19/Nov. 1 
 Holy Great Martyr Barbara Dec. 4/17  
 the Hieromartyr Charalampus  Feb. 10/23  
 St. Onuphrius the Great
 June 12/25  
Enlightenment of the mind for learning Sts. Cosmas and Damian Nov. 1/14 
 St. Sergius of Radonezh July 5/18 
 St. John of Kronstadt Oct. 19/Nov.1
Dec.20/Jan.2 
Deliverance from horse plague Holy Martys Florus & Laurus Aug.18/31 
Driving away of evil spirits from people and animals St. Basil the Great Jan.1/14 
 St. Niphon Dec.23/Jan. 5 
 St. Maruthas, bishop of Martyropolis Feb. 16/March 1 
Protection of livestock from wild animals Holy Great-martyr George April 23/May 6 
Deliverance from alcoholism Holy Martyr Boniface Dec. 19/Jan.1 
 St. Moses the Black Aug. 28/Sept. 10 
Recovery of stolen things Holy Great-martyrTheodore the Tyro Feb.17/Mar.2 
 Holy Martyr John the Soldier July 30/Aug. 12 
Recovery of lost things Holy Martyr Tryphon Feb. 1/14 
 Blessed Feofil (Theophilus) of Kiev Oct. 28/Nov. 10 
Protection from evil spells Sts. Cyprian and Justina Oct. 2/15 
Deliverance from lustful passions St. Martinian Feb. 13/26 
 St. John the Long-suffering July 18/31 
 St. Moses the Hungarian July 26/Aug. 6 
 Holy Martyr Thomais April 13/26 
Seeking a new job or a new house Blessed Xenia of Petersburg Jan. 24/Feb. 6 
Source: ORTHODOX LIFE, Holy Trinity Monastery, Jordanville, New York., No. 4. 1989., pp. 25-27. 
Additions by Father Demetrios Serfes
Protection from Earthquakes St. Demetrios the Great Martyr of Thessalonica Oct.26/Nov.8 
Cancer St. Nectarios of Pentapolis Nov.9/Nov. 22 
Seeking employment St. Nectarios of Pentapolis Nov.9/Nov. 22. 
A birth of a child St. Irene Chrysovalantou Jul.28/Aug.10 
For lost items St. Phanurios of Rhodes Aug.27/Sept. 9.
St. Nectarios of Pentapolis wrote:
"Our Church honors saints not as gods, but as faithful servants, as holy men and friends of God." 
St. Silouan of Holy Mt. Athos wrote about the saints:
"The Saints were people just like ourselves. Many of them stated with grievous sins but through repentance they attained the Kingdom of Heaven. And every one who comes to the Kingdom of Heaven does so through repentance which the Merciful Lord granted us by His sufferings."
St. Silouan also wrote:
"The Saints in heaven through the Holy Spirit behold the glory of God and the beauty of the Lord's Countenance."
Logos:  
While there may not be a specific saint for what you are looking for....from personal experience I can say that St John of Shanghai and St Xenia of Petersburg have been of particular help in that department.  Also, while I am not a male nor called Seraphim, I consider St Seraphim to be my patron saint.  When in particular need I always find solace from him.
If you need to talk ...PM me with your number and I'll spend a few with you......miriam
Logos:
Pray to Blessed Margaret of Costello if you can. She was born blind and deformed, and lived her early childhood in an outhouse because her well-to-do parents were too ashamed of her.
She later joined a group of Dominican tertiaries, was renowned for her acts of charity and penance, and was persecuted by some of her unworthy sisters, to the point of being driven out of the order.
Through a lifetime of rejection and gratuitous pain (pain is never gratuitous!) Christ was her mainstay and her light; her best friend and Savior. She was assuredly On the Road to Heaven for Sure through all that pain. God bless, Logos!
In Christ,
LT