Hang in there. There's nothing I can do from so far away, but if I could, I would. Hospitals are not where any of us want to be, but if it's what's needed - then you're in the right place getting the right care.
I remember having a blood tap. The worst thing to have attached to your body I swear. Had mine on for just under 2 weeks and had to sleep on my back which I don't like doing in a stuffy hospital ward
In Sept. 2019 I woke one morning early with the worst acid reflux I have ever had and nothing helped. I drove myself to the ER. They kept asking about my heart and I kept saying I was there for acid reflux. At 5 that afternoon having had a CAT scan and blood gasses checked I arrived by ambulance at a much larger nearby hospital which was keeping their cath lab open late for me. It had one of the best cardiac surgery departments in the area.
5 days later I had triple by-pass surgery and am now a member of the zipper club. I am still going strong today. The current state of cardiology is pretty amazing. They can fix a lot of stuff. I was 71 with COPD and hypertension as well as a genetic heart condition not involved with my heart attack and surgery.
I am betting you will come out of this all OK even if getting there is not a joy ride.