Grizz,
What you are feeling is normal. Your body is craving for a fix and is punishing you for not giving it! The good part is only have to endure all this one time, if you just stay clean you never have to live through this shit again.
I had very bad days early on, in fact there were days I did not get anything done other than staying quit and you know what, that was enough. I stared sometimes at my computer and could not form a clear thought other than to stay quit, and that was enough.
If you can only accomplish one thing then make that staying quit. Nothing you will do today is more important. This will pass and you WILL start feeling better I promise.
I suggest drinking plenty of water, gatorade, fruit juices. Continue to eat small meals through the day and keep your sugar levels even. Stay close to the site and read everything you can here. Get some fake, seeds, gum, candy, straws whatever else you need. Buckle in and get through this...
STAY QUIT
Greg