You know the end of the late nights studying is near.
I'm sure that'll take a lot of the pressure off you. Receiving news of breast cancer of a friend is never easy, but try ensure you are healthy and well yourself first. If you are on meds, ask your pdoc to tweak them until you feel you are a lot more stable.
Don't take on more than you can handle, because that can land up in disasterous consequences.
The wheel will turn, and you will land up coming out on top