When you posted this earlier, it reminded me of something that happened to me, but at the time I could not remember the name of the medication I was trying at the time.

After reading your latest post, I remember that the medication was Klonapin.
I was in WalMart. I had this odd sensation and I thought I might fall - I grabbed the shelving unit. (I didn't have a cart with me.) The lighting was bright in the store, but it slowly, over maybe 15 seconds, dimmed way down, like it was a brown out or something. It didn't get all the way dark, but like twilight. I looked around, but no one else seemed to notice. The sensation passed, and gradually the lights came back up. A few minutes later, it happened again. I was standing near a woman, and I must have looked funny. She asked "are you ok?" and I said - this is going to sound funny, but is there an electrical problem in the store? Are the lights doing something funny? She said no, everything is fine... I said, ok, then it must be me.... I went out to my car, sat for a while. Called the doctor. Didn't know if I should drive. Doctor said it was probably the Klonapin, discontinue it. She thought I would be ok to drive home. It didn't happen again.

I wonder if what happened to you was similar, except it effected your hearing instead of vision? It sounds so similar to what happened to me - my vision dimmed, your hearing dimmed. I felt like I would fall and so did you. Etc.

I was only on the medication a couple weeks when it happened. Can't remember exactly. I think I started on smaller dose and was working up.

I tell you, it was one of the strangest things I have experienced. All the lights going dim, but no one else noticing. I thought for sure I was having a stroke or something major.