Your post almost sounded like what I am experiencing. I am 26 as well. But I am taking Pantoloc(protonix in the US). I can not eat hardly anything without nausea, cramps, diahrrea (in that order too). I have been living off of crackers, plain bagels, plain toast, and arrowroot cookies that WERE suppose to be for my son(those things are addictive)...basically anything bland without spices, fat, grease.
I am awaiting the results of my H. Pylori breath test which I had over a week ago...but I'm guessing probably negative like all the other test results. I was told to stop taking the Pantoloc 48 hours before I had the breath test and within the first day the heartburn was back 1000 times worse, which led me to start taking them after the test just to stop the acid. I was on Pariet before that and Ranitidine before that. None of those 2 helped. The Pantoloc seems to be the best, but I still do get nausea and the burning sensation in the stomach from time to time.
I also have anxiety attacks alot. The first thing I do is read the side effects of the medications because I had a bad reaction to one I was taking to contol nausea. That incident made me "paranoid" to take any with more than headache as a side effect!
I have been to a gastroenterologist and he could not figure out what was wrong with me. My family dr. is stumped and even admits I am too young to be having so many problems, but still can't figure out what it is. It feels like I have basically lost 2 years of my life because of these symptoms. I hate the thought of living the rest of my life like this and hope one day this will be figured out.
Have you tried taking another PPI? Some work for certain people while others don't. I find that Pantoloc and Pariet (Aciphex in the US) don't have that many side effects listed as Ranitidine and others.
Sorry to ramble on, but I just wanted to say that I sympathize with you. I am probably not much help, but know a little of what you are going through.
Hope you feel better soon and find some answers!
Donna