“It will absolutely stop if you drum hard enough... but you may have to use something more substantial than your fingers.”
Drum for how long? How often? Does this become a permanent solution (cure)?
If hard enough, it only takes one good solid blow to the back of the head to cure it permanently. ;o)
To my knowledge there is no known “cure” for sensory-neural tinnitis. Some people experience relief from “masking”, which is putting a narrow band of white noise in the ear with a hearing aid type device... but that can often make speech more difficult to understand. I’ve heard of people sleeping with such devices or leaving the radio on with just static at night.