I have hEDS and a few other comorbid conditions that are either congenital/hereditary or caused by the hEDS over time. As for viruses, saying a chant or having a cleansing ritual isn’t a bad idea. I do a cleansing shower each week and then I have little things I say when washing my hands or sanitizing them. Mostly for the medical issues, there is a medicine chant/prayer that can be said, I will look again in past posts for it, but I have consulted with my primary care physician whenever I am going to try something natural or different to make sure that it won’t interfere with any other treatments I may be using at the time.
@Amethyst was it you that had the medication prayer? Do you remember the post that it was under? I can’t find it & I thought it was you that had written it. I meant to write it down, but my brain switched off shortly after & I have lost it & switched computers since then.
I found some other posts that may be helpful:
Medicinal and Magickal- an Introduction to Heather! 
Fighting and Preventing Illness: Herbs and Plants for Immunity