It’s exactly the same with me. Covid in October, and same symptoms, though my fatigue is mostly constant with some moments of feeling well. I’m 68. Tests are all normal. I started seeing a nutritionist. She had bloodwork run on me looking for inflammation, and the numbers are off the charts. My body’s response is also off the charts, and she said it explains all of my symptoms. She’s treating me with supplements to fight the inflammation, and has me on an anti-inflammatory diet. Cutting out dairy was the first thing. This is all fairly new. It’s probably been a month. So far my fingers have almost completely stopped hurting. I also found a doctor who practices intergrative medicine. She’s treating me with energy work, plus helping me in other ways. My body responds strongly to the energy work. I’ll have to see what all of this does long term. This has given me hope.