^ I'd suggest a doctor's visit too. Something isn't right when it's a lingering pain.
As for most of the posters above, foam earplugs are a godsent sometimes. I always have a pair or 2 in my backpack. Nights can get awfully noisy sometimes in the woods -- Public campsites too (ugh). Don't get the earplugs with the "headphone-type" plastic attached -- they suck, and they're dangerous.
Being in the manufacturing and factory and construction trade since I was 18 (now mid-30's), I have tried a lot of different types of foam earplugs. Some are soft and some are hard. The harder ones, that cancel more noise out, tend to make my ears sore. I have no problem with the softer ones.
As an avid cyclist, sometimes the wind bugs the heck out of me, so sometimes I throw in a pair of the foam earplugs or some noise-cancelling ear buds via mp3 player.
A heavy fleece stocking cap works good too, but not near as much as foam ear plugs. I have a fleece stocking cap for hunting, and sometimes it's a bit too much for having to hear the small game rustling around! -- but it sure is warm!
Get that checked out with your doc!