Mental Helath is detiorating and withdrawls HELP ASAP

I already have a w from this semester as I was taking 4 courses now taking 3, and now ive fallen very behind and confused in applied econometrics which is a required course for my program. and considering another w. But it creates really bad pattern. It also doesnt help that I'm behind in basically all my courses except an elective. I debated a gap sem but couldnt becuase of financial implications. I'm on osap disability now becuase of my crippling depression so I only need to pass 1 course this term but i also feel that I'm not fully mentally present i just go to classes for the sake of going to them and don;t study after class. everytime i do i zone out or I'm highly inefficient. I'm a 3rd year so it crazy to me how I'm struggling with my study habits . Today i can only get 20% of my tuition back so i wouldlove to get someones advice. Everyone keeps telling me to push thru but i guess I'm scared of an F or D becuase I'd like to go to teachers colleg. If i mess up this sem then I'll just have to accept that being a teacher was not in the books for me. PLZ HELP. I was doing just fine last sem i had A's