Update:
I had an appointment with the ENT on Wednesday. He was really nice! However, he didn't seem too concerned about the tinnitus sticking around. He was confident it was due to inflammation since it temporarily subsided with the steroid. He mentioned that my eardrums were "clinically perfect," which was reassuring. He prescribed Lipo-flavonoid, but I was a bit disappointed as it felt like he was just guessing. I have a bottle that I bought but never opened, so I'll give it a try. He suggested doing a follow-up and having an audiogram in a month, so that's my plan. I'm staying positive about what the tinnitus will be like by then - maybe it will have disappeared!
The hissing was very low last Thursday and Friday, but today it has increased again. I'm hoping for more quiet days in a row. The musical tone in my right ear is still there but quiet. Its volume hasn't really changed, even as the hissing fluctuates. I'm fortunate that I can only hear it if I'm wearing my AirPods - I keep the volume extremely low and mostly listen to podcasts, not loud music. I still sleep with earplugs, which I know some people have mixed feelings about. I can still hear the tone in my ears with the earplugs in, but I haven't had any trouble sleeping yet. I'm hoping that it will eventually go away too. I'm still optimistic.
I hope this is helpful to others.