I was about to mention the differences between OCD & OCPD like that but I didn't completely know how to describe OCPD, since I haven't gone through it myself and I would guess that it's slightly less common than OCD. :P
I just knew how to describe OCD as people that use their obsessions and compulsions in hopes of ridding themselves of their anxieties, although they know that their acts are unreasonable.
I haven't entered college yet so I don't completely know how it works; is there anyone you can talk to, about getting a therapist more knowledgeable about your personality disorder? Hopefully you can find someone experienced enough about OCPD that they'd know how to successfully treat you, or provide you medication that can help cure you of your desires to do everything perfectly. Be sure to mention your OCPD specifically so that whoever is determining your therapist, can give you the best therapist for you. Hopefully it would seem like you're just being given a new therapist for the new semester, like what would usually happen, so that there's no hurt feelings? If not then tell your therapist that you just need someone that would focus more on your OCPD than your depression, because you know that your depression is caused mainly by your OCPD.
I would also suggest mentioning your disorder to your professors, so that they're a little less harsh on you and less skeptical of you spending so much time doing schoolwork. Mental illness is truly a terrible thing and I just wish you the best in your recovery. :/