It doesn't help that I have almost completely lost confidence in medical "studies and trials" after the past 3 years. The system is broken. I have pretty severe tinnitus. I worked around guns, missiles and heavy machinery for 30 years.
Yet the article doesn’t mention chronic exposure to loud noises as a cause! It says “Its known causes can range from a buildup of earwax and insufficient peripheral irrigation in the inner ear to brain damage and bruxism.”
I exposed myself to lots of loud noise over several years when I was young and that triggered it for me. It wasn’t as constant as what you were exposed to, though.