Yes!...and eat good food.Unsolicited Advice Warning, Ignore If Needed
Having just escaped out the other side of graduate school, the best advice I can give is that even if you cannot do anything else to make things better, sleep as much as is humanly possible for you. It doesn't make the other stuff stop, but it makes it a lot easier to react to than when sleep deprived.
Not to make light of your despair, but this helps with mine:
This too shall pass, it might pass like a kidney stone, but it will pass.