Ugh, sorry about that. Been there, done that.
Sudden hearing loss in one ear is an emergency-so you should go to the ER. (I just googled it to make sure).
If you can't or don't want to go to the ER: Do you have an urgent care center near you? If it's ear wax, most of them will be able to clean it out on the spot. Around here we have quite a few of them, including in pharmacies.
I hope this gets better soon.