Wow I am just reading this after googling my symptoms for over a year! I have exactly every Thing that you mentioned- I had all the blood work you can imagine, lung xrays, breathing tests, heart test, saw and ENT who said I had mild throat irritation from possible acid reflux... the SOB comes in waves. My bilirubin was high as well and my doctor said I have Gilbert’s disease but then other tests showed normal bilirubin levels - it’s so confusing not truly knowing what happens because it becomes so uncomfortable, I get irritable around people as I’m trying to gather myself to catch my breath and it’s not until I sigh or get a deep yawn that it goes away, only to come back. I’m not sure if it’s good allergies, caffeine reaction, environmental.... I haven’t had allergies tested but once this covid 19 is over with I’d like to check off the rest of “possibles” off my list...