Is college the same as university?
If so, that's a great experience, so good luck with your qualifications.
In work, though, as masseur_i says, concentrate on work ~ don't worry about girlfriends, or college ~ and make sure that you get plenty of sleep and good nutrition.
If you are worrying about work, that will make things worse. If you have managed to go two years with no problems and then suddenly start having several problems, then there must be a reason. Perhaps your mind is elsewhere.