It's possible that a medication side effect is causing your tinnitus. The good news is that medication-induced tinnitus tends to resolve when the medication is switched to something else or stopped. Check with your doctor about the possibility that a medication is contributing to your tinnitus.
Okay, just one more question:
Do you have a family history of hearing loss in young adulthood? For example, did any close relative lose his or her hearing without a clear cause before the age of 40?