Health anxiety is horrible especially when you get into panic mode. It helps me if I try to keep occupied, doing anything that will distract me from focussing on my symptoms all of the time. If I focus on how I'm feeling then I notice every little sensation and then they become all I can think about and I get that sick panicky feeling. I hope this will soon pass for you.
It is our thoughts about what might be happening that keep the panicky feelings going. If we can stop the thoughts that feed the anxiety then we start to feel better. Easier said than done, I know, but well worth trying!
Hugs,
Moondust
ps sometimes I even do the ironing!!