Did you see a doc about the irregular heartbeats? if someone has told you your heart is okay, then i wouldn't panic. Maybe just give it a little time and try some different GERD solutions and see if time helps at all.
If your PCP thinks all of this is caused by GERD, asks him what he recommends you do about it.
If your GI guys think it isn't GERD, ask them what they think you should do.
Then use your best judgment and figure out what you want to try first. Or maybe you just want to wait a while to see how you do.
I will tell you that I was struggling with severe GERD a while back after an esophagus dilatation. I had spasms in my esophagus and was panicked and worn out. I had been in the ER and they had run a bunch of tests to make sure the dilatation had not poked a hole in my esophagus, which it hadn't. I was still in a lot of pain and unable to swallow much, so I called the GI guy back. His snotty nurse wouldn't even let me talk to him. Instead she told me he wanted me to go in for three more procedures, including another scope. I was worn out and decided I couldn't handle it. I went to our local urgent care where I met the kindest doctor. She told me to relax and told me it would take many weeks for my esophagus to heal after the dilatation. She told me not to worry about not eating--that my body would let me know when I could do solids. She gave me some xanax to help with my nerves and the stress. She also taught me some breathing techniques. What a difference!
And you know she was right! My situation has slowly gotten better without all those expensive, painful, and invasive tests.
Sometimes you gotta trust your gut. Doctors sure don't know everything! :)