This is not a question so much as info to be added to the ongoing discussion. I too have experienced hives followed by painful daily/nightly bouts of acid reflux and belching. I've lost 8 pounds in a week due to nausea. I was tested for H. pylori(negative), lipase and cbc both normal. As a precaustion my doctor gave me a 10 day round of meds for systemic yeast. I also had a cat scan and that was normal. I went to an allergist who is having me tested for food allergies and suggested I take h1 as well as h2 antihistamines. He suggested I might have Eosinophilic Esophagitis which is an inflamed esophagus due to an allergic reaction. I found this website if you want to read up on it: http://ezinearticles.com/?What-is-Eosinophilic-Esophagitis?&id=2289454. It sure seems to fit the description of my symptoms. I have an appt with a GI doctor in 2 weeks to arrange an endoscopy and biopsy to confirm eosinopiles in the esophogus. I have found some relief with Allerest and Prilosec. Not eating after 3pm seems to help with the nightime attacks of heartburn. I will keep you posted.