I have suffered from exactly the same thing for about 50 some years. Having a fever will always trigger an attack but most come for no reason and I am miserable for a couple of days. I can’t even comb my head on the side the attack is on. I have never seen a doctor for it and really have never found anything that makes it better, just have to wait until the attack is over. I just can’ afford to see doctors and have a bunch of tests and still no real answer. The good news is it hasn’t killed me. I often said though if the pain was constant it would or I would at least wish I was dead.