What Causes Excessive Burping, Nausea And Feeling Of A Lump In The Throat?

I keep getting daily episodes of a squeezing feeling, lump in throat, pain across upper back and terrible burping and nausea. I ve had two HIDA scans for gallbladder and ultrasounds, I m on Aciphex for reflux and take xanax as needed for anxiety. I m scared something is squeezing my upper stomach like peritoneal cancer or a tumor or something. I can t lay down at night to sleep often it wakes me with severe pain, nausea and sweating and lasts a few hours before it is relieved. Can anxiety really bring this on? I take gas-x and tums and xanax and advil when these attacks get bad.