I have been having the same symptoms since September 2022 from a viral infection (could not confirm if it was COVID). All blood tests came back normal, except for inflammatory marker as positive. Muscles aching on both thighs, shoulders and tendons back of the knees. I am on Prednisone 5 mg twice a day for now, it's the only thing that relieves the pain.

All of the sudden got either a new covid strain in Feb of this year, or a respiratory illness, and it brought out long covid. I did not not have long covid issues initally other than some muscle pain, etc. Now it is way worse. Brain fog, etc. My blood work is normal, and just have no clue what other blood tests to get done to find out markers that show immune disregulation. It is kind of defeating to go from healthy to feeling like this. If you find any other medications people are using for long covid, etc. or blood tests, let me know. Not sure what else to do at this point as most of the doctor's scratch their heads.