Hi! Thank you for sharing your story. This is so much to go through. I am a 30 year old female with no previous health issues and am having almost the EXACT same experience you went through with almost all the same symptoms and also had a laundry list of testing done with no diagnosis. Also was in and out of the ER. They put me on Cardizem and feels like it’s just masking the issue and not actually getting to the root of what is going on. I’m on month 10. I am currently at Mayo hoping for a diagnosis but have not gotten there yet. If you’re comfortable with sharing, did you end up getting a diagnosis? How are you feeling now? I hope you are doing better!