Hi p1994, well I can guarantee you that you aren't pissing me off!! I know you're probably getting a few "dunno"'s from me, but I am really trying, and maybe between us, with your help........
I know your feelings about the girl it must be really painful for you and the "If only"'s have to be so hard. And (?), the "So near, yet so far"'s but still not being able to let go.
But if it isn't going to happen between you. or maybe she really isn't the girl for you, then however painful it is (and I'm sure it will be) the more distance you try to put between you the more space you're going to have to work through/past those feelings.
And really how special can she be to be having such a negative impact on you?? I'd say no-one's that special. You deserve to want/to have more for yourself than this. You really do!!
Perhaps think about the kind of gap's she's "filling" for you, or the things not going so well for you that she's helping you to "bury", and have a think about how to get or handle those things without her. Without the pain she's causing you. I know, way easier said than done, when she's such a big part of you/in your life, but............might take plenty of time and pain......but..........
And as for failing in your course, social, professional life, well I know it's got to be real tough, but do you think you could be a little less "demanding" on yourself. You're not in the best place right now, so maybe take it a little slower??
Do you think it would help to focus on making just one of those areas a bit better at a time, starting with whichever is the most important to you? Or maybe think of just one small step you can take in each area to just try to put you on the road to......e.g. with your course ask for some more support/advise from a staff member/tutor??
Try to see it as a good thing that you're seeing a psychologist though. Because it is!! It's an opportunity to start to slowly "pull things back together".
As for the people who are getting pissed with you, maybe try explaining some of what you're going through?? But if that's not a possibility/doesn't work then I'd say just "cut them loose"/distance them if you can.
Alison