HELP! marijuana addiction?

I did weed on and off last year. I quit for nearly months at a time but I always fell back into it. I can't get it out of my head. After 3 months of nearly heavy usage I've quit. And i hope this time its for good. I've been clean for a week. I need help. I can't eat anything without throwing up, I have a really hard time sleeping (i havent slept for 3 days) and I'm all shaky and feel dizzy alot. Everyone says weed/pot/marijuana isn't addictive and doesn't cause withdrawal! They're wrong. What can I do :/

: http://alcoholdrugstreatment.info/help-marijuana-addiction