Tinnitus is a very common PCS symptom. For some of us, it becomes a life long annoyance. I have almost constant tinnitus. Usually not so loud but if I consume anything, it increases in loudness. I have checked the pitch as compared to a piano. It is just above D#6 on the keyboard. About 1244 hertz or slightly above. It has stayed at this frequency for years.

Yes, too much information but what do I say, I have PCS OCD.

Don't get suckered into any tinnitus supplements like Quietus. They do not work and are expensive.

My best to you.