Wondering ...

So lately I been always wanting to eat a lot and every morning I wake up feeling sick ? but in the afternoon it comes off ? then when I'm sitting down I get upper back pain and I always have to pee and I'm always gassy sometimes out of no where I'll get pains in my boobs but it comes right off and also a few days ago I been having a lot of cramping &' I already had my period I got off of it on the 13th of this month &' also when I get home all I wanna do is just lay down and at night around 9 or 10 ? my lower back starts hurting a lot , what can be happening to me ?