Pain in left leg due to weather change.

Hi there since past 5 days the weather has gone haywire so has my pain. Since 5 days I m suffering from stinging pain on the left leg upper portion behind. I'm allergic to NSAIDS so I can't just keep popping pain killers etc which make matters worse for me o. I'm also possibly arthritic with the lower back region in stage 1 mostly as some experience doctors claim I'm fine whereas other say I'm not possibly due to slush season of pain.But now I'm again at the peaks of pain. Isn't there any permanent solution or I'll be suffering like this for my life permanently. Been physically fit most of time but this pain hampers my daily exercise routine which is swimming+Workout. Sometimes matters are worse that I feel like it was better that i didn't have them legs literally as it would make me less bothersome but then again it's called life and everyone suffers this so I take all my anger on God/Lord or whatsoever because even after such high tech and improvements still must undergo such torture