Hi LM, and welcome to Anxiety Zone!
Your post fascinates me. I was not familiar with Adult Separation Anxiety Disorder, so I did a little research. It is not included in the current DSM (Diagnostic and Statistical Manual of the American Psychiatric Association), but has subsequently been recognized as a psychiatric disorder. The DSM in usage today was published in 1994, with a text revision - not an inclusion of new material - published in 2000.
The next edition is due for publication in May 2013, and I am guessing that it will include ASAD.
However, you did not write in order to fascinate and educate me, but to ask for advice. According to what I have read and you have written, I think you may very well have ASAD. A firm diagnosis would require an in-depth clinical evaluation. Obviously, I can't do that on line!
If you are indeed diagnosed with ASAD, then it is not going to go away on its own. The literature indicates that since the disorder is so newly identified, there is not yet a standard treatment. ASAD is currently treated with a combination of therapy and medication.
My suggestion is that you schedule an appointment at a mental health agency, perhaps with the Student Mental Health or Health Services at your school. With your degree of insight, I think you would make good progress in therapy.
Please let us know what happens.