Definitely withdraw now. W is better than an F. And I believe the F stays on the transcript. If you retake the class and pass, the F is overwritten, but if you find you don't need the class, that F is still there messing up your overall GPA. Get out now.
If you have to take it later, maybe having a different teacher will make all the difference in the world.
Fridays suck. Went in to work this afternoon and found there was mayhem in all directions. It didn't really get better as the night went on, either. So if I didn't have to take my MTX tonight, I'd be having an adult beverage instead of the juice I'm drinking now.
Hope you are feeling a little better tonight, Magic. Hugs to you.