Please take care of yourself...what time do you see your T tomorrow? Maybe you should call her (or text or e-mail) to give her a heads up. Even if it's too late for stitches (I know nothing about the timing for that), you probably need some sort of medical care to prevent infection. Or to prevent excessive blood loss.

And please get rid of whatever implement you used so you're not tempted to hurt yourself like that again before seeing T... You're too good of a person to hurt yourself even more...