Have you gotten an MRI? I thought my tinnitus was caused by noise, but since it was primarily present in one ear, the doctor thought otherwise. Some of it was caused by some damage to the ear, but most of it was because of a 3 inch tumor.
Tinnitus sucks, and I miss silence (I also miss hearing in the now deaf ear, but it's not so bad). The problem is that stress increases the beeping, and of course the beeping causes stress. And the stress from trying to not hear it only makes it louder.