I truly understand what you are going through!!
I am writing this as the mother of a college student, but I am also someone who went away to college and ended up transferring to another school and communiting from home everyday.
When I went back to college for the 2nd semester, I was very unhappy and felt as if I just couldn't handle being away from home. I begged my parents to let me come home and they gave me a really hard time about it. I finally went to see a counselor who agreed that maybe it was better for me to transfer schools. When I did, I felt it was the best thing that I could have done.
On the other hand, my daughter is a sophomore in college. The night before we left to take her there in her freshman year, she came to me, crying hysterically that she didn't want to go. I told her at that point that she had no choice. She was extremely upset that everyone else seemed to be so excited about going away to school. The first week, I got phone calls from her at all hours of the night. Ironically, those friends that were so excited about college were also feeling a little homesick, too. She got through her first semester, but the same feelings started all over after she went back for second semester. But, now, the second semester of her sophomore year, she refers to college as "home"! However, after sophomore year winter break, it still was a little difficult for her to go back to school, having been home for a month (Once she got there, she was fine!)
Sorry for so much rambling- but the point is that everyone has to find the situation that works best for them. Seeing a doctor may help you to assess whether you are feeling "normal" separation anxiety, or whether there is more to it.
And, it is normal to "want your mommy" when you are not feeling your best- even at 47, I still want my mommy at times!!