Methamphetamine is strongly dopaminergic to the point of neurotoxicity when consumed in usual "recreational" doses. So, you're dealing with a huge change in the way various neurotransmitter systems work,
combined with some small amount of brain damage. (Which is highly cumulative, especially as longer term use has a deleterious effect on sleep which will compound whatever damage is caused.)
Basically, no one can tell you what's going to happen, but
probably your tinnitus will slowly trickle back to normal over the next 3-21 days.
I'm not high and mighty enough to say "don't smoke meth, duh", but I will point out that any given time you smoke it has a nonzero chance of causing you permanently worse T or other long-term problems.
edit:
@stophiss I wouldn't conflate these things; PCP and Meth are toxic in a way that LSD isn't no matter how much you take -- and I've seen sporadic anecdotes about low-dose, infrequent LSD use having a
significant positive impact on tinnitus perception.... and of course other anecdotes that point the other direction.
Meth is probably less toxic than alcohol on a purely physiological level -- also wildly, wildly more addictive, and even more likely to cause people to impulsively commit acts of violence. Sounds like a bad time!