Back pain and vomiting

Taia

So I have this painful upper back pain that doesn't feel better with moving positions or anything. I have to take pain pills to make it better and that doesn't always work. I'm 4 weeks postpartum and I've had it for a while but yesterday afternoon. I suddenly got this nausea and idk what happened but I think my back started hurting and the pains mixed and I felt this intense kind of pressure in my chest and back so I got really scared and had my boyfriend take me to the ER. Well after getting there and in a room I threw up and almost immediately started feeling better. They did blood work. And a chest X-ray and those were normal so they sent me home. Well last night I woke up around 4 am and got sick again but this time multiple times. It sucked. I've been trying to drink plenty of water and eating a few crackers here and there but When I did eat the crackers I felt nauseous again. Anybody else have any issues like this?