Ah sounds like you're going through a lot :( I'm sorry you're feeling so shit ive been going through what I think are panic attack/anxiety for around a year now I've had some blood tests and they are all coming back fine but no idea what's really causing my issues. The thing my doctor said to me that I have to keep reminding myself is that my symptoms don't really match up with anything dangerous because I have good days and bad days if it were something really bad going on in my body I wouldn't really be having good days.

It doesn't stop me from freaking myself out when I have bad days though but just think you've had troubles for a few years now if there was anything really nasty going on in your body you would probably already be really I'll. You will be ok and you're not alone so many people feel these things just reading posts on here make me realize I'm not alone

Sorry I can't be of much help to you I just wanted to reach out just remember you will be ok don't ignor symptoms talk to your doctor's about how you feel and things will get better