Hi Bubbiee,
Sorry to hear you're having so much trouble. (Congrats on the weight loss!) It does sound like you're really struggling. Do you like your GI doctor? Is he/she talking and listening to you? If you feel like you're not being taken seriously, it might be time to look for another GI doctor. I found I needed to change doctors before I found one that took my concerns seriously, and really listened and talked.
20 mg Nexium, once a day is not a very high dose PPI. Many of us have been on 40 mg twice a day. Judging from your symptoms, that low dose isn't doing the trick. Also, you might want to try a different PPI. Everyone is different, but I found Protonix to work well for me.
Don't give up hope...you can get better. Try to relax, since anxiety and stress makes your stomach produce even more acid.
You're in a good place. People here will offer you support and share their experiences.
Take care,
Denise
