Today makes it one week for me! Been pretty rough in patches, but as long as I stay busy, I'm ok. Still have times when my brain is "mourning" the inability to get high, but I've been able to keep it together and stay positive. I put together a vision board that I placed over my desk to remind me of all the things that are important to me outside of substance abuse, and it helps.
If you're not familiar with vision boards, here's a basic summary:
How to Make a Vision Board
Example of what one may look like:
Sobriety vision board image by Foodfetishlv on Photobucket
I used pictures and photos that triggered emotions in me, and they really do the trick when I'm starting to feel anxious.