Depression??...

so I think I’m going through depression or some form of PTSD. Little backstory, had a rough childhood and went through a lot of things that shape me who I am today. My family is filled with alcoholics, druggies and psychos.My mother has 3 mental illnesses including multi personality disorder. I have a strong demeanor and good head on my shoulders. I never let my past get to me.. until I got into a relationship. I think my childhood traumas is getting in the way of me being open and myself. I cry a lot, always irritated, binge eating, reminiscing etc. I’ve always been this way but it’s getting worse the older I get. Therapy is way to expensive. How do I bring this up to my doctor?