Welcome, 'cane.
Sounds like your ears aren’t self-equalizing. As you dive deep, the eustacion tube won’t allow air to enter the middle ear behind your eardrum, and the pressure difference applies pressure to your eardrum.
To equalize the pressure, grab your nose, and gently try to blow out of it, even though it’s blocked. your ears should pop, and feel like the pressure has eased, and you should suddenly be able to hear better. Release the pressure by opening the throat and shifting the jaw around. Ears usually decompress more readily than they compress.
BTW, I ruptured one of my eardrums in overhead surf at Ocean Beach last summer–miserable, scary experience.
I was on a steep, bowly left that was horse-shoeing in ahead of me, so I dove off head first to penetrate, and got a little sideways, and when I hit, I heard this PWEEEEEE-GURGLE GURGKLE GARKLE! really loud in my left ear. Upon surfacing, I was horrified to see the world tilting violently up on it’s side and spinning rapidly around! I had some serious vertigo. It was so bad, I definitely couldn’t see, or anyway process visual information enough to orient myself or identify direrction. I was tumbling and spinning and falling, just sitting there. After flailing around trying to find my board and figure out which way to shore, I got hit by the next wave. Underwater it was worse! I could no longer discern which way was up! after flailing around, I reverted to my winter training, and grabbed my leash at my ankle, and started to hand over hand by feel, until I got to my tail. I then grappled onto the board and sat there until the next wave smacked me, and I belly rode it in, trying drunkenly to stay straight.
Then I hit the beach, crawled to shore, stood up, took three staggering lurching steps to the right, and bonked my forehead right into the sand! From my mixed up point of view it seemed like the ground tilted up and smacked me in the noodle! I lay there for about five minutes, desperately grabbing onto a violently spinning, pitching world, that I felt like was going to throw me off into space any second. Just to add to the fun, I got rapidly motion-sick, and puked onto the sand.
It was extremely debilitating, and was the least in control of myself I have been in a while.
Eventually, the spinning subsided to a manageable 15 degree yaw to the left every second or so, and I was able to weave my way up the beach to the truck. My ear was bleeding, and tentative gentle attempts to equalize produced a loud cacophany of rumbling fluids, and an increase in the spinning, so I left it alone. plus, it was starting to hurt real good at this point, a line of searing pain from my throat to the middle of my skull, and throbbing too.
Long story short, I got to the doc’s, and they dropped in some antibiotics and shoved a cotton stopper in to keep anything from getting in there, and sent me home with a good batch of pain meds. (Mmmmmm, paaaiiin meeeeddds!) When I was at the follow-up appointment, the doc took the stopper out, and there was a bunch of sand on the end of it that had drained out of my ear! He was quite surprised, and mentioned that the sand probably contributed to my acute vertigo. I was going to Nicaragua in two weeks, so the doc said that if it was gonna rupture again, it would probably do so on the plane, and to stay out of the water if it did. No problems.
He also told me that ruptured eardrums are the reason many divers die, the vertigo disorients them and they can’t find their way to the surface, or accidentally go too quickly…
Scary stuff.
Wells