Getting through this is usually a day by day basis, at least for me. I have also had very similar symptoms as you - I've been to the ER twice for intense stomach pain (my simile: it felt like a basketball on fire was lodged in my stomach) but by the time I saw a doctor, it was over (usually lasts for about 20-30 minutes). So all I got out of my two trips were prescriptions for Gaviscon.
My triggers are spicy foods (even a little paprika does me in), tomatoes/red sauces, water (when I drink it on an empty stomach), chocolate, and though I never noticed a problem while I was drinking them, I now completely avoid coffee, tea, and soda. I only drink water.
Booze is a huge problem for me, which sucks because I am young and love to drink. I haven't had any alcohol in two months now. Wine (red or white) bugs me, as does beer, and hard liquor. That doesn't leave many options, lol. My GERD flare-up's don't happen until the next day, though... very strange.
I was put on Nexium 40mg/day, which stopped me from being up all night with heartburn (but I think it was more because of my lifestyle changes, not the meds) and I felt like poop all the time. My stomach always felt bloated and distended. I'm doing a little experimental hiatus from the Nexium right now... It's going well. I am feeling very pre-heartburny but nothing serious. I hope it goes away :(
I have to agree with the very wise MockTurtle that you should see a doctor. Your symptoms are all over the map. I have not been diagnosed except for my doc giving me a PPI to 'try out' for 6 months. I understand that you want to stay away from the meds, but no meds can permanently damage your esophagus with the acid baths it gets every day.
Best of luck to you!