I was homeless for 2 weeks and I need advice about how to recover?

I was recently homeless for 2 weeks and during this time I disciplined myself to eat as little as possible and I rationed my food to last me throughout the day. I slept on a park bench and sometimes on a sidewalk. Now I find myself not being able to eat as I used to. No matter how much I try to force myself to eat I just cant get myself to swallow food. I find myself only eating small portions just as I was when I was homeless. Lastly I can't sleep, the slightest things startle me and bed feels like a park bench. Please I need help or advice I can't afford to see a doctor so believe or not this is my best option.My weight also dropped from 200 pounds to 185.