First you have to figure out what's going on. I have a feeling you have tendonitis, but without examining you I cannot tell for sure. If it's tendonitis, then NSAID's (ibuprofen, naproxen, or something similar) and rest should help you. I would take it easy for 2 weeks, take some ibuprofen (400 mg with food every 8 hours) provided you aren't allergic or don't have a contraindication (history of GI bleeding, other bleeding, kidney insufficiency/failure, etc.), and if that doesn't help, go see a physician. If you've fallen or suffered some sort of trauma, then you should see a physician earlier to see if you need an x-ray.