I don't really feel like getting into specifics, but I had an incident and had to drop. Two times. With a semester I didn't drop in between. Two semesters of W's entirely, and I've still got 5 II's off of like 12 or 13 applications. The W's don't seem to be a problem at all. I'm prepared to explain them if they come up.
I talked to someone on an AdCom at a school I applied to and he said "We view taking withdraws to avoid tanking your GPA more favorably than tanking your GPA". Withdraw. If you finish up strong, do well on the MCAT, and can explain that extenuating circumstances (even without mentioning depression) made you think W's were a better decision than struggling through with C's and D's, you should be fine. There's also the idea that a semester of W's while you focus on getting better will be better than a few-semester long battle with depression (at least) that affects your grades over a large period of time.
I'd withdraw and focus on you.Take care, man. Take care. PM me if you ever need a friend. Best of luck.