Feeling Scared With My Anxiety

Hello everyone,
I am currently 22 years old and suffer with anxiety and depression. I have been on Zoloft and Paxil in the past to help treat these disorders, with Paxil working the best. Now, I am off of Paxil since it caused a lot of weight gain and started Wellbutrin to help with my depression, since I thought my anxiety was not so bad. It seems that my anxiety is coming on again with me worrying a lot about school (I am in college) and even with work (I have a retail job being a cashier). I am starting to have OCD tendencies, which I may have had them before since I was around 18, of which I cannot get through my assigned college text book readings without re-reading stuff. I have excellent grades and I am in good standing with my job, since I am a trainer, but I am plagued with self-doubt and excessive worry... When I was on Paxil, it took care of the generalized anxiety I had and even with the OCD tendencies, but now I am starting to feel how I felt before starting Paxil. This really sucks... Anyone have any advice on how to cope with this, or experience almost the same things as I do?? Let me know