Lost and Found - MessyNessy89

The Order must be trying to erase my memories. They brought me home for the weekend, but I'm locked in here. I have to get out before they come back for me and try to finish the job.

I think someone wants to help, but he/she is afraid of being discovered. My mind is too foggy to figure out what this person is trying to tell me. Can you?

"Nessy
Start with the Basics.
12 17 16 5 23
Remember that infinity is just an 8 that fell down
-An old friend"

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Puzzle discussion is here:

http://www.lg15.com/bbsposts/list/10/40/165/1