Ring in the ears is very common with the sensation changing from time to time. I think I understand your sensation of 'full of cotton,' too. I just attributed it to the tinnitus. Right now, I feel like I have my foam ear plugs in, but I don't. It is sort of like the feeling when you are in an airplane that is descending and the pressure is increasing.

The one thing I know about it is simple. The more you let it annoy you, the more your brain will focus on that symptom. So, it is best to try to ignore it.

My best to you.