I feel sad reading how you took a vaccination hoping to safeguard your health and it set you back in this way. The only thing I can think of to suggest off the top of my head is trying out a sheepskin on your bed if you haven't already. I picked one up myself in the discounted "As-is" section of Ikea this past week. Another suggestion that now comes to mind is you might try (if you haven't already) is using hypoallergenic laundry detergent. Your skin may prefer special detergent at this time.

Although thankfully my rash problems have cleared up I still find that my bed covers seem too heavy on my skin. I have been trying to locate a Bed Cradle that can be placed on the side of one's bed rather than the many I see advertised as foot cradles for only the posterior foot of the bed. I have finally located a few side cradles but they run in the $100+ range, so I may keep my eyes open for a used one. I never did identify the underlying cause of my reoccurring rashes but I found Epsom salt baths to be helpful in my case. - I wish you a much better New Year.