After 3 days of intense lower back pain and a fever and a migraine, the physician told me it's a muscle sprain. He didn't check my temperature or anything, just gave me tylenol 3, codeine and 2 muscle relaxants. He said whether it's still there in a week it might be my kidneys and I should go get it checked out again. Is he silly? Shouldn't I get it checked out now before it gets too poor?
You could have an injured back and a migraine at the same time, just by coincidence, but neither would cause a fever. Infections cause fever. I think you should see another physician.
Sounds like an incompetent physician alright.
Get it double checked.