God Bless You. I am praying for you right now. This looks miserable. My suggestion would be to go to someone that deals with Long Covid (Long Covid Clinic), try another allergist, pulmonologist or maybe even a dermatologist to get their take on this. Have you tried Benadryl, Zyrtec, Benadryl cream or Hydrocortisone cream? Soaks in Aveeno Oatmeal soak just up to your neck? That is used to treat skin irritation & itching. I used it when my kids had the chickenpox. I used Corn Huskers Lotion (old remedy) when I had a terrible case of the hives one time and it did wonderful. It smells awful, but, it worked for the itching and swelling. I would try a small area to see how you respond. It took a while. Check with your functional medicine doctor before trying these please. I am so sorry this happened to you. Hugs & Prayers. I care. Please keep me posted.