Thank you for your reply.

My symptoms are the same! Everyday is a struggle, even on good days, it is still there. All my tests have come back normal as well. My chest pain is more left/middle. I was prescribed pantoprazole. I did find it helped with the chest pains thankfully, however the chest pain (although minor) seems to be returning and I'm already taking two a day as prescribed. So perhaps it's not doing its job anymore.
Last week on a particularly good breathing day, I had a moment of bad breathing and it sent me into a panic attack. The first time this has happened since this all originally started in August 2019. So I'm pretty fed up!
This panic attack has left me reeling for days and rittled with anxiety. So I've called my doctor to discuss this anxiety.

Please let me know if you have any luck with the zoloft, if you find its helping you at all.
May I ask what kind of breathing exercises you've been doing?