So for the past few weeks I've experienced horrible nausea every day, feeling full, horrible back pain that radiates up and down into my shoulder blades (worst symptom), a bad taste in mouth and over all pressure in back and stomach. Idk if its gerd or what but its scaring me and ive had abdominal xrays and blood work and supposedly it was clear but it still worries me as to why im feeling like this :(
if it continues, u can get a ct scan of abdominal organs or mri . xrays only see so much.
u dont have to live with this pain, so insist on further testing! OR get another doctor.
it may be something that can be helped with certain medications.
i had symptoms and after tests, found i had a bad gallbladder that was removed.
u just need answers .
take care 
Have you seen a gastroenterologist?
I get this All the time to Mine has been going on for a long time now.my doctors say mine is anxiety.but I also get all kinds of other pains as well.but I am so sick of going to doctors that I don’t even go anymore.because its always the same answer.I’m just so done with this.I just wish it would get it over with all ready.so tired of feeling and thinking I’m dying everyday.
i used to get this too and i was extremly worried like you. the more you think about it, the worst it be. trust me, it will go away! in the meantime, just relax! muscle tension is making your pain worse so relax! :))