You might want to think about that you have to take care of yourself first to be able to do all these activities. If you don't take care of yourself you wont be able to do any of them. It might help to prioritize the activities you do and see which ones you might be able to think about taking a break from so that you can take care of yourself. People will understand.

I understand the need to be able to do everything. I was at that point in undergrad and ended up in the hospital. Then I was forced to take a break. It would have been better had I been able to take a break before it got to that point.