I've been off percocet for >2.5 months; 12-18/day for 3-4 years.
How much were you taking?
Do as bmac suggested: Thomas Recipe and
tons of hot baths...
You are in the hardest physical w/d's right now, but the good news is, you will start to feel better real soon(~day 4).
Your body needs to start "firing" again, by producing it's own pain
killers(ie. dopamine)...the L-Tyrosine and
Vit B-6, that is a part of the recipe, will dramatically help with that.