I am very, very sorry to hear this. it sounds & is brutal. Also, if I may, your students -- suffering themselves (I know how exhausting it can be helping them get over the finish line; the health issues, physical & mental, are profound & ubiquitous), might let you share & even appreciate a teensy bit of what you're experiencing. It's tricky to do & maybe you don't want to but it might provide you (& them) some relief.
As someone else said, take care of yourself. Sending you strength.