It's a difficult subject to explain Mike.
I sympathise with you, and anyone who gets ill, it's not nice.
For me, I've not been ill in many years, way before CVD19 came about, I've taken no particular precautions against that or any other CVDs, but always been conscious about what actually goes into my body, I mean things like eating as well as possible and avoiding pollutants in the air and toxins in general.
Fingers crossed, it seems to have worked so far, and I hope your recovery was swift.