Should I go to the E.R.??

I woke up feeling nauseous and having back pain/ upper abdominal pain Wednesday and Thursday morning. It only lasted about and hour both times so I wasn't really worried. Welll I started hurting again last night around 6, I was able to go to sleep around 8. I woke up at 1A.M. hurting really bad and extremely nauseous. I had like 4 bowl movements from 1-7 A.M. Also threw up once, and lots of dry heaving after that. I was hurting really bad all night, no matter how much I tossed and turned or went to the bathroom I couldn't get relief. Then I started what I'm assuming is my period at about 8 A.M. My last period was less than 3 weeks ago though, and my next one wasn't due for 10 more days.. It's now 11A.M. and I'm feeling some better, my nausea is gone. I'm still hurting but nowhere near as bad. I was going to go to the E.R. I was hurting so bad when my husband got up but by the time we were walking out the door I felt some better. I don't have insurance and can't afford urgent care copay right now. My question is even though I'm feeling some better is this something I should go in for still? I'm a little worried it could be pancreatits, as I've had these symptoms off and on for a few weeks just nowhere near as bad as it was last night. I've noticed some fatty matter in my stool, and honestly I've never hurt like that before in my life. Idk what pancreatits is like though as far as how the pain feels? It was kind of like a constant deep ache, all through the top of my stomach right under my boobs and into my back