It seems that I'm regaining some of my hearing, but it's nowhere near enough to be of any use. My frequency range is between 30 and 350 Hz now, with a strange, isolated peak at about 850 Hz, but aside from that, nothing. For comparison, my good ear can still hear up to 16000 Hz. Another hearing test is scheduled in September.
On the plus side, the vertigo is almost entirely gone. But that could also mean that the physiological conditions in my inner ear have gone back to normal and that this is as good as my hearing's gonna get. Hopefully I'm wrong, but I don't think so.