OCD?

While studying behavioral science, I diagnosed my mom with Obsessive Compulsive Personality Disorder (OCPD) - which is characterized by people who are perfectionist, "set in their ways" and "don't like change: and people who think their way is "the only way to do things."; she wanted me to expalin the difference between OCPD and OCD (plain ole' obessive compussive disorder.) I told her that OCD was people who had a mental imbalance and therefore were compelled to do things such as check the lock 40 times, wash their hands excessively, and so on. She's kind of a smart aleck - so she said, "So I have OCPD, and you have OCD." Funny mom, funny. . .however, there may be a hint of truth in that. . .for instance my first ten minutes at SBs today was spent:

Order: Large Low-Carb Chai Latte with Soy in a to-go cup, ice water in a white styrofoam cup, and an empty coffee cup.

Table Search: booths were taken, two tables by plugs - so I took the one that faced east/west; I didn't want to sit facing north/south.

Table Rearrange: it was faced perpidicular to me; I had to change it to parallell

Table Add on: I literally picked up a table from the middle of the store & toted over to my area (I had to find the one that was the same size as mine)

Plug: the plug must run behind my computer - therefore I had to face east.

What do you think? OCD or Crazy Medical Student or a little bit of both?