Heya,
I can think of a couple things right off the top of my head cause they all happened to me and are happening again, probing eminent in 2 weeks to find the source...
Could be
Gastriitis
Ulcers
Stomach Erosion
Pancreas
Liver
Kidneys
H_Pylori
I'm kinda joking a little and not, these could all be true and more, but what I should tell you is you need your primary of GI, hopefully your GI to hear these symptoms asap and have him test for all the possibilities.
Could be you need something as simple as zantac, or something else, bloodwork should be done and get the elimination process out of the way before you may have to get scoped or not, depending.
You know what I mean.
My pancreas hates me this month and is shooting my lipase above human levels again for the last two months, this not only causes stomach pain, nausea and back pain, it also cause all your stool to pass much rougher through you, like we need that, cause the enzymes for breaking down fat are starting to back up into my bloodstream.
Geez I hope I nailed that, thats the way my gi describes pancreatitis
Anyway, get your gi to jump on it,in the mean time over the counter zantac cant hurt simple acid reflux and light nausea, I aalwyas keep zantac nearby for my frequent heartburn which is funny since I never eat anything spicy.
Anyway, ranting away, you know the drill :)
thanks
Jon