First of all, happy birthday!
I completely understand exactly how you're feeling right now, because I went through the exact same thing. As graduation approached, I felt horribly depressed and claustrophobic, dreading the end of school (which I thought was really fun) and fearing the unknown. I had a paper to write that I actually didn't finish until 3 months after I was supposed to graduate (I managed to get an incomplete and more time to finish it) because I just couldn't do it. I had no money and knew that I was going to have to move home with my parents for a while. My mom was very excited about this, but I dreaded it every second.
Well, I lived through it and it really wasn't bad. Yes, my first job had nothing to do with my degree -- no, I didn't go to college to work at a one hour photo lab looking at everyone's pictures. I did find a job in my field after about 6 months, moved to an apartment with a friend, and eventually went back to school. I think it is a good idea to work for a year or two before going to grad. school -- at least it was for me. Grad. school can be a lot of work, and you definitely don't want to be sick of school when you start.
While you will spend time stressing about your paper and finding a job, take time to have fun, too, and try to relax a little bit when you can. You are feeling something almost every college graduate since the dawn of time has probably felt (at least those of us who didn't have awesome jobs lined up ahead of time) and you will get through it.
Good luck!!
