Welcome, joeyjo. I'm no moderator, but you made two threads. It makes it easier for us to help you if everything is in one. :)
My knowledge of thyroids is minimal at best, but it's not uncommon to switch PPIs. However, PPIs in the long-term can also do some harm.
I initially thought I was having heart trouble, but it turned out to be the result of GERD. I had EKGs and such, but nothing was found to be wrong with my heart. Endoscopy revealed problems.
I'm not sure how helpful this is, but I hope it's of some benefit. I do know someone with thyroid issues and will talk to them if it helps. I'm mad at her, but I'll do it anyway. lol