There are ear plugs that can be used while diving (Docs, Hydro Ear??). They will reduce the bubble noise.
I'd been researching the marketed-for-SCUBA earplugs because I've had occasional trouble clearing an ear. DAN's Alert Diver magazine, Q2 2023, has an article recommending strongly against them--bold-face "DAN does not endorse the use of any earplugs for diving."
As to tinnitus and diving, my understanding is that unless there is barotrauma, there is no likely connection. But the hydration advice is sound, from my reading (and ringing). For me, sleep seems to be the most important mitigator.