Fund for used car to have son visit

My name is Eric and I've suffered from Paranoid Schizophrenia for over two decades. I've had some really low times in my life, such as being hospitalized several times, failed suicide attempts, and a victim of sexual abuse. That being said, in 2011 I met a woman that I fell in love and subsequently dated. A month into our relationship, she discovered she was pregnant by a former boyfriend who she had lost all contact with. I stepped up and became her child's father. I fell in love with my son and felt I had finally found a family that I yearned for my entire life. Unfornately, my girlfriend cheated on me. After 4 years of raising my son, she decided to leave me. Now I can only see my son a few times here and there but not nearly as much as I'd like. The car that I own is over 20 years old and dying. I really need help purchasing a used car that is dependable, so I can visit my son regularally. Please help me...