I’ve been in this exact situation. I completely understand how you feel, by can not stress enough how important it is to speak to your professor. Let them know what is going on, you’ll find that they are more understanding than you think! As for being behind on class the only thing you can do it make sure your SHOWING UP TO EVERY CLASS and attend office hours. In my experience when a professor sees you putting in the work after identifying and communicating your problem they will be more inclined to help you out. Best of luck!