I have gastroparesis (stomach paralasys) and I have difficulty with C all the time, to the extent that you are describing, but I had to have testing done as well, and Shawn is very correct when he says that it has been too long and especially if you have exhausted all methods, especially when it comes to laxatives not working. I'm also a student at a university, but I'm assuming you are an undergrad?? Most, if not all universities have a campus health center where students can recieve health care, and the university here requires all students without health insurance to use the campus insurance. Please find out where on campus your health office is located and make an appointment, and if you are still on your parent's insurance plan call home and see if it is valid if you are out of state, or at least let your parent's know you are not well. I'm sure they would want to know right away so that they can get medical help for you. As a parent, I would want to know if my son or daughter were ill.
I hope you feel better very soon.