Perhaps you can take an incomplete and then next semester take a lighter load of classes? For me, personally, I find I have to try my absolute hardest at everything I do, 110% or nothing. And, if I have too many things on my plate, I go the route of doing nothing... Because, you know, I can always say I could have done better if I tried... Better than trying and not doing good enough, yeah? Well, that's how my head works. Anyways, last semester, I ended up just leaving in the middle. I had hit my limit. But then, I slowly got back on track. Two of my professors gave me incompletes, one I passes, and one I'm getting a late withdrawal for. Next semester, I'm only going to be taking one, possibly two classes. That way, I can focus all my energy on doing well in just one. Maybe you can do something similar? If you're worried about financial aid, you can check with you mental health services on campus.. they might be able to get you an accommodation where taking half load still counts financially as a full load of course work.

Try not to be discouraged, even though it's hard.

In the future, you could also check to see if your school has a writing center. They'll be able to help you get started on your paper, plus if your professors know your going to the writing center, they'll know you're doing everything in your power to get your work done. Generally, professors are much more kind when they know you're actually trying and not just slacking off. Which, from the sounds of it, is not what you're doing.

Good luck!