Help!! Sorry kind of long

Well, last night I ate a plate of ravioli and meatballs at like 4am and when I got in bed I felt like I was dying like super bad cramps and stomach pain and if I breathed in hard enough it sent a really sharp pain up my back and then it started going away after about 20 minutes so I fell asleep. When I woke up a few hours later my stomach felt really full and hot on the inside and I had heartburn and nausea. Ive also been having frequent urination but my bladder is completely full like every hour. I almost went to the emergency room but I figured I'd wait it out as Im only a little queasy now. AF is due the 2nd. What do you think happened?