CRP was over 3,000; this was the problem. Sed rate was 1.
They did tests for lyme disease, polymyaglia rheumatica, lupus, thyroid.
A muscle biopsy (needle) was done, too, and X-rays were taken.
The rheumatologist told me that he would do the test again when I was off the cortisone; but he OKed me to run again, based on the second bloodtest.
Funny thing is, I am running better than ever after a 6-7 week hiatus from running, with only long walks.