tinnitus cure. found something that works for me. why???

I am a senior with severe hearing loss who has has had tinnitus for many years. mine sounds like a truck engine idling, low frequency rumble sound. i especially hear it at bedtime.
recently, I tried placing my index fingers in each ear (blocking external
sound), & then made a loud hum sound in my throat. did that for few minutes. Tinnitus (loud rumble) disappeared.. stopped dead.
have been doing this for several nights & works for me. does not last.
but it does STOP the rumble.
so can you readers try this & confirm if it works for you?
also any researchers might consider looking at why this method turns my brain off to the tinnitus?