How is your hearing Biff? I had tinnitus before and my audiologist told me it would go away once you get hearing aids. He was right. I did put up with it for years though. Have you ever had a hearing test as a baseline? He also told me that me left ear was worse than my right ear and said that's from driving around with the left window down. Constant noise takes it's toll.
I'm just the opposite. My right ear is worse. I blame it on being right handed and operating power tools. Farmers get it in one ear from their tractor noise and looking back at their plow. The window thing makes sense.