A Compulsive Disorder of the Obsessive Variety

Hmmm... Many people have reviewed this already, but I will anyway. We'll call it a 2-for-1 deal, as I can see that the second piece is reviewed a lot already.

First of all, the nit-picks;

My therapist has me sit on the couch across from her desk. That is not going to happen.

My therapist wants me...
You contradict yourself by saying what you have there.

I think this:

The fewer things I touch, the fewer germs I will come in contact with.

would flow better like this:
The fewer things I touch, the fewer germs touch me

The spot feels contaminated from where she touched me.

Maybe:
I feel contaminated where she touched me
What you have is a little wordy, and if taken literally it doesn't make much sense.

Also, your last sentence is a little wordy too. Not sure what you can so about that one though; perhaps split it into two?

General
I like how you have made the character speak in an obsessive tone. It's good.Short sentences do well in this, as well as short paragraphs. There is one up to top, about sanitizing the doorknob, which is a little longer. You could split it up, making 'all of those germs are now on me' a whole paragraph. I think that would make it stand out better, and make the story flow a little. However, the first one about the therapist is fine, because it's introducing.

There wasn't much that was bad about your story, so I'll point out good things so you know what I like about your writing, and you can use again if you make a part three.

I think it's nice how you have the break in the middle; it swiftly changes the focus from germs, to numbers. However, you do continue this a little into the second half of this part. You could try and make this a little shorter, so the focus change is more obvious.
By having the last sentence, it kind of ties the two scenes together, which is good. This is just more about the two focus' though.
I like the entire story, actually. The whole idea of an obsessive compulsive is interesting. The story flows well, and the character is defined excellent by how the first person narrative is written.

Ka Pai!

I have to say that I loved this piece! You had me hooked with the first line. I love your character and the way you kind of let us get a taste of what it's like to be OCD. But the one thing I had a problem with was not knowing whether or not your MC was a boy or a girl. That's really my only complaint and sometimes that's hard to catch when writing in first person. But it really needs to be said right on the first page. Anyway, I loved it! Moving on the part two.