Overwhelmed, plus some.

Stressed doesn't even begin to describe what I am right now.

Overwhelmed is much more applicable, but even that doesn't have the right connotation sometimes.

Maybe if you qualify overwhelmed with "overwhelmed to the point that I have to try very hard not to throw myself off a building" then it would be accurate.

Physical therapy school is really killing me (and all my classmates) for the next 3 weeks. There is no end.

Maybe I don't want to be a physical therapist anyways.