Wendy - I just hope things can look up for you and quickly. There's really not much more I can add. Except that I'm here for you if you want to vent.
A supportive social network definitely helps, and if it hadn't been for one or 2 of my close friends to pull me out of the depths of depression, I do not know what I would have done.
Just know that with regards to your mental illness, it is just a matter of time for the cycle to change. Ride this one out for now. You cannot begin to tackle the other issues in your life until you are stable and can make rational decisions.

Maybe put your university plans on hold until you are more stable. You need to look after yourself now; first and foremost. And you are getting into a nasty spiral of anxiety vs no sleep, which needs to be addressed asap. Can your pdoc give you some stronger meds for the time being? At least sleeping tabs?
Please don't let this lack of sleep get out of hand.
I lead a pretty lonely life too, revolving around only really my boyfriend and work. The only people we really socialise with are his friends, who I don't have much time for. So during work hours I try and get my piece of love and acceptance from this forum.

HUGS