Should I work on a Covid unit or refuse and probably be terminated?

I take 5 pills for high blood pressure, and I am about 50lbs over weight.  I read an article today about people with hypertension more likely to die from covid because of the blood pressure meds..  Ive had heart problems for years which dont cause me problems unless I dont take my prescribed meds..   I wasnt thinking when they called and told me I would be working on a covid unit Saturday.  My husband wants me to quit my job. My sister who is also an RN told me to refuse to go.. I would probably have to get another job somewhere soon.. Tell me your opinion.  They said the reason I was picked was because I am fit tested for an N 95 mask.  Well, shouldn't everybody in healthcare be fit tested?  What should I do?