When I first got T I didn't have pressure change the issue. Not until I woke one night and I had re-pushed my jaw out of place. That happened in March. Which caused my quite almost gone T to restart up with a vengeance. It was super scary and I had tons of new noises. But I noticed right away that every time I moved, swallowed, breathed and so on the pressure in my ear shifted. That's what scared me. Especially for driving/travel as just walking it would have to re equalize. Heck, laying down. I knew it was messing with my T and making it louder when it reacted.
Doctors didn't care and had no answers for me as my hearing was still super great. In fact, they were so dismissive and didn't believe it was really happening. The chiropractor I went to that put my jaw back in place told me it was common for TMJ and that it might fade. Going into my 7th month since this happened and it has gotten better. However, I feel super pressure in my ears my T kicks in a high loud noise. It drowns out almost all other noises.
Even after my jaw finally got put in place I still had severe pressure issues. It took about 3 months to put it in and keep it in. I realize what really helped now is that I have a massage therapists who massages my neck, TMJ, and head. When the pressure thing would kick in and my ears couldn't quite sort themselves out the T noise I got from it would last 30 min to an hour. Now it lasts seconds and quits. My ears are getting much better, though I still have issues.
However, I've gone on all day drives with 1,000 ft elevation changes in short periods of time and my ears do better. The last loud pressure Ts I've gotten have all happened at home when I became congested and my ears couldn't quite adjust. I'm going to Bear Tooth Highway which goes up to 10,000 Ft and I wonder how things will go then.
I've found that information on pressurization issues vary and there's no clear answer. Many say it's from Eustachian Tube Dysfunction. Barotrauma which is only supposed to last maybe an hour max. TMJ symptoms are wide ranged and while my chiro said it was common I had a hard time finding real solid info on it.
But like I said my massage therapist has been a big help. She even does a massage that moves the ear and makes my muscles release. I know when I hear cracking and stuff now that it's from my muscles and cartilage on my Eustachian tube.
Hopefully you can find some help in my long winded reply. Most advice is that it will either resolve itself or not. Mine is slowly getting better so I'm hopeful. I've really never had issues with pressure in my ear accept for one bad flu.