I'm in kind of the same situation as you are. I had my T&H under control until I made a couple of really long phonecalls two weeks ago which suddenly and unexpectedly made everything blow up. Now my T has almost doubled, my H makes even normal sounds uncomfortable, and speaking on the phone for more than a few minutes makes my ear burn, something which I never had before. It's unfair, I never knew that could happen, and I just want to undo those calls and go back to the way things were, because as bad as that was, this is much worse.
However, I try to keep in mind that it's still possible things will recede again in time. Sometimes the body needs time to heal, and I'm hopeful that maybe in a few weeks or even months I'll go back to the way I was. And even if I don't, I will try to habituate again, like I did last time. Having a big setback is terrible, especially if it's not even really your own fault, but things can get better again, gotta look past now. Just gotta be patient and try to stay calm. Stressing out definitely makes everything worse, no matter the situation.