3 years ago I had a medical for work and had almost no tinnitus. A bit of softness in my right year but no constant ringing. Now however, I have moderate tinnitus.
I blame riding at high speed for 30 minutes a day on a DL650 with a noisy screen without ear protection. My commute takes place almost exclusively north of 50mph in the morning and about 60% above those speeds in the afternoon.
I now wear a variety of disposable ear plugs or my Shure SE215s
As for power tool usage during that time, all I have is a 3/8th drill and a dremel so I don't think that is the issue.
"A good traveler has no fixed plans and is not intent on arriving." - Lao Tzu