I'm like this, too... But I'm told it's because of my rheumatoid arthritis.

Thing is, there's nothing about my RA that shows in blood tests - I have a serum negative form.

My rheumy has often advised me to move to somewhere where the barometric pressure is more stable as I will then have less flares than with crazy Sydney weather.

I guess it's possible that you have a mild, serum-negative form of RA that's just enough to give you pains when the weather changes but not enough to give you constant pain. Although, I never though I had constant pain until my rheumy asked me to start feeling it so he could start treating it...

BW