Been feeling badly hungover in the mornings!!! No drinking!

Hello all, just hoping for some advice cuz I'm kinda scared. For the last two days I've woken up feeling TERRIBLE. Entire body sore, neck and shoulders mostly, headache, acid stomach....just like a typical hangover for me. Btw I tested for pregnancy month before last, last month a short, but there, period. Nothing abnormal there. And of course my first instinct is to drink water and I do. I'm stumped and miserable. Had a bad day before it started where all of a sudden I was super sensitive to caffine because 2 cups wrecked me. Shaking and nauseous. But normally a caffine headache will last all day. This goes away in a few hours! Can Any one relate?