Thought I had the ear ringing thing for sure. Was working in a long building setting trusses. Morning everything was fine ,in the afternoon i rotated the upper part of the crane to do rest of building. Worked with the exhaust ringing my ears all afternoon. About a week later I had a spider bite on my left forearm that got huge. The two together had me going to a after hours joint as soon as I got off of work. Lanced my arm and took some cleaner to my ears..... Magic. Ring stopped right now and the arm cleared up in a week. Do not suffer see a DR> it might be simple fix.