It may be hyperacusis or recruitment. Recruitment is sensitivity to certain frequencies. I have loudness discomfort levels around 90 to 95, which are borderline. You can get yours tested by an audiologist. I still get fulness when my ears come under assault by loud voices close to my ears, like the telephone, but I can go to New York city and others places and enjoy life. I take my custom made musician earplugs just in case. They are a great safety blanket. It does take time to adjust and manage, but you can do it.

Hi Zenie,
I assume you have some kind of hearing loss, which would account for the fullness. The sensitivity is hyperacusis, which can be precipitated by hearing loss or other causes. You don't say how long you've had it. Mine started last year after I suddenly lost hearing in one ear. I also got tinnitus. Like you, I was devastated, and had to give up my social (and music) life for many months.
However, it has improved greatly. If you haven't had a hearing test, you need to get that done. The brain eventually 'desensitizes' and very likely you will be able to get your life back. Be patient. I know this doesn't help much when you're going through it but don't despair. It will get better.
Kat