What's wrong with my body?

Okay so I was recently thrown out of my house and lost my job. I live in a trailer now, and my mom is a heavy smoker. Besides those really hard things, I've been eating healthier, stabilizing relationships, And I am sexually active if that has anything to do with it. I have horrible gas/ dirrehea. I'll get up and have instant head rushes all the time and I'm always full. Any idea? Please respond asap