This is timely information for me, thanks much to all who have contributed.
I have been experiencing ringing in ears ever since as a boy I had a homemade firecracker blow up in my face. But for the past month, after a particularly noisy jam, the level of ringing that is always present has risen to the point of being louder than anything else. But also I do have stress and teeth grinding, so maybe this has something to do with it as well.
The only time I don't notice ringing is when I am playing (easy cure...)
Thanks for the info and I will be trying some of the remedies posted. My sympathies to those experiencing symptoms.