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My wife had similar problems for about 18 months after a dive trip to Cozumel in 2018. Eventually it got better, but we were kind of freaking out about it after a while. She was getting dizzy as well which caused nausea, treated that with regular meclizine doses.
Had a similar experience after a benign pool dive (it was a 20’ deep pool though, lots of up/downs over 2 hours). Had some issues equalizing but felt like I managed it fine during the dive. No “pop” or pain. However, when I got out, I had immediate fullness in the right ear and lightheadedness (not dizziness which is how people describe vertigo). The constant fullness went away after a week, constant lightheadedness only lasted a day. After that the fullness and lightheadedness only occurred when physically exerting myself (strength training) or being in a head-down position. This lasted for a about 6-7 months, on/off tinnitus as well. ENT had no answers after the usual treatment options didn’t help (decongestants, anti inflammatories, etc). I’m diving again without issues but even 3 years later my right ear doesn’t feel quite “back to normal”. Short story long, your issue is from barotrauma and will hopefully get better on it’s own with time. Symptoms and recovery times seem to be more variable than most “information sources” would have you believe (in my experience and talking to others who have had similar injuries diving). Unfortunately, it’s not likely any medical intervention will make a difference at this point. I’ve looked into things like eustachian tube balloon dilation and such but the risks didn’t seem worth it (although to be fair your symptoms are worse than mine were). Good luck and let us know how things work out.
