Until a recent change in medication I've taken stemetil for many years.
Can't believe they haven't done other tests! Sounds similar to a lot of the things I have and can be very disorientating and annoying at first, well, they still are for me but I've had over 10 years to get more used to them.
I would be careful about anything that moves when you are still, like lifts and escalators (hold on to the sides, even in a lift) and anywhere too loud, especially with lots of different loud (or loud to you) background noises going on or lots of people talking. Loud music can also made my symptoms worse. Lots of flashing lights can be uncomfortable too.
If you are off balance and find your special awareness isn't good then allow yourself more room if possible and be careful when going to sit on say a wheelie chair, I tend to bang into a lot of things, catch door frames, cupboards etc... and have missed sitting on my work chair many times which, being a wheelie chair, is not good.
If tinnitus is causing problems then I find having headphones on can help, mostly with music for tinnitus, but sometimes I just have headphones in on silent as it controls noise better and is quieter. Even low background noise like I have clocks which tick or having the radio on really quiet, even when not on a channel, just buzzing.
Never found anything that helps the weird frequency changes! I get a loud ringing sound (like a high tuning fork) and quite often one side of my hearing just shuts off. I actually enjoy the quiet sometimes when my hearing is down, it can be more uncomfortable when it first comes back and everything is "too loud".
I'm saying this more from a Meniere's Disease point of view but if you are having similar symptoms, even if they are hopefully short-lived, I'm hoping some of this might help a bit.
If you drive, might be worth checking DVLA guidelines about it. Not saying you would drive like this but while things are ongoing it might help to be careful, even if you feel better at times. I have never driven but know there are some kind of implications about driving licences and certain conditions. I think I would have be medically signed off to be able to drive with Menieres.
I hope some of this helps and you are feeling better soon or they do more tests if not. It can be a horrible thing to have but you're not alone :)