Try this

1. put your thumbs on your ears

2. rotate your hands so your index fingers are on the base of your skull, middle fingers just above

3. now put your index fingers on your middle fingers and "snap" them down on the muscle at the base of your skull some 10-15 times

4. if your tinnitus goes away or reduces, it's caused by muscle tension instead of nerves

This blew my mind when I first tried it, but looked into it and it makes total sense: we all work on computers all day, necks get fatigued, and the impact forces the muscles to contract until they force-release, alleviating the tension-caused tinnitus.