Sounds like it was some extremely strong stuff, but since you only did it once before it might have been too soon to eat it in brownies. I started a very long time ago, but have never eaten any. I did much stronger psychedelic drugs when I was young, like LSD and mescaline, and occasionally had effects like that. It's not bad for you, if you learn from the experience.

It will definitely wear off - I wouldn't worry. Try to avoid caffeine, get rest, and eat healthy.

Maybe next time, have a toke or two rather than eating it. You didn't give any indication of your age. I also think that it's better if you're over 18 or so years old.