Sounds like an acute depression, a fast-moving thunderstorm. I had the same, a few months after developing T. I wretched at the thought of leaving the house, going to work etc. Human contact was instant overload, as if I were at the absolute limit of stress. I hid in my basement for hours, staring at the television tuned to the "snow" channel to drown out the T. Couldn't work for more than a couple hours at a time. Then I'd go back home and hide.
Time is on your side for three reasons:
1. Just as water eventually seeks it own level, so does your disposition. The old "you" is still in there and will eventually re-emerge.
2. People adapt with time. Just as we develop callouses on our hands (you've probably adapted to repetitive friction with musical instruments), we develop them on our brains with regular exposure to things like T.
3. Anti-depressants take time, but they work, especially for non-chronic cases like you seem to be. They fix the anomaly and get your brain chemistry back to healthy. Meanwhile, I'm sure strange thoughts abound. I remember going to the supermarket (when I had recovered enough to do that) and recoiling from the contrast in the red and white floor tiles. Bizarre things like that. Don't know if it was the anxiety/depression lingering or a side-effect of the meds. Anyway, enjoy your journey through the dark neighborhoods of your mind that you didn't know existed. It's an education! You'll emerge street wise and able to relate to others as I'm relating to you, or at least I think I'm relating to you.
Regarding the sleeping pills, are they literally sleeping pills or anxiety meds?