Here's the latest. I visited a doctor, but not a specialist. I have a referral for a specialist, but the doctor thinks it will resolve itself on its own over the next few days.
What the doctor thinks, and I think there may be some validity to this, is that wearing earplugs ALL the time, may not actually be beneficial. What the ear and brain does is it adapts. So, if your hearing is normal, but you deprive yourself of practically all sound, your brain will adapt so that your hearing becomes super sensitive.
And this is what was happening with my ears. Every time I removed the earplugs, I found myself super sensitive to ANY noise, even noises most people would consider to be very quiet, such as the ruffling of paper. The more sensitive my hearing became, the more I believed I needed earplugs.
The more I wore them, the more sensitive my hearing, etc. So eventually, your ears (or your brain processing what's picked up by the ears) become super sensitive. So my brain was basically amplifying everything.
Right now, I'm sans earplugs and letting my brain re-adapt to a normal range of noises.
I found that as I was having a normal conversation with the doctor, I barely noticed the buzzing. But, now that I'm focusing on it (by writing about it), I can hear it. I really do believe that this will just become a non-issue over time.
I am going sans earplugs for good, unless I find myself in a 100+ db environment for any longer than 5 minutes.
Edit: it feels and sounds like my head is stuff up. I think it's because the normal flow of air is blocked up when you wear earplugs 24/7. My recommendation: wear earplugs only when necessary, otherwise your brain will adapt and amplify everything.