My senior year, last semester, of college, my depression became so overwhelming that I simply could not function. Fortunately for me, I had been regularly seeing the head of counseling services at the university for a couple of years, and he recommended that I take an incomplete, go home for the rest of the semester and through the summer while I got the depression more under control, and return the next fall to finish up my student teaching semester. He contacted the professors in charge of the education program and explained to them (in general terms) why I needed the incompletes. It was a horribly difficult choice to make. I was literally a couple of months close to graduation. But I took his advice. I have never regretted it. It only postponed graduation from May to December. A few months is truly nothing in the grand scheme of things. That counselor helped set me up with therapy in my home town; my pdoc found a pdoc near my home town to work with me while I was home. I rested A LOT. Was under orders not to think for a month or so. Went to work after a month or so with my mother at her office. Returned in August to complete my student teaching semester. And graduated in December.

I don't know if that might be an option for you, but sometimes a break from the mental stress is what you need, and that's near to impossible to do while you are juggling 5 or 6 college courses. If it's not an option, consider dropping courses to what is absolutely essential that you take. The world won't come to an end if it takes you a semester longer to graduate.