hey, I too am a lonely gapper, my closest friends are at uni, as is my boyf and the majority of friends who aren't at uni are going off travelling soon.
I'm working as an auxillary nurse, so I get to meet lots of people, and alot of the other nurses are students of about my age, so I have people to talk to at work, but I work on the bank so I move wards and don't have a chance to get to know and make friends with people. I've tried to overcome this by joining various groups, I've started volunteering at a Scout group, I'm helping to teach archery at my old school, I'm planning to join a BSL group and/or a social sport. So why not try doing something like that? Even if you only do it for a couple of weeks, and only meet one person you get on with, that person will have friends and you could suggest that you all go out together, so you get to meet a bunch more people. If you can't find anything like that to fit in around work, and you want to do something slightly less social, why not take up an instrument? It sounds really corny, but there must be something you can find that can help you get out more.
And to cure the work bordem- find a holiday that you want to go on, or something you want to buy for yourself, and think of the money you're earning to get that when its really bad. I carry postcards of Nepal around with me which i sit and look at on my breaks when I'm having a bad day and want to be in bed not cleaning up old people's poo, and that makes it all seem worth while, because if I don't work I know I can't afford to go there next year.
Good luck with it all, if it doesn't get any better then we can arrange a social for all of us friendless gappers!