We often have distorted, unrealistic beliefs about urges. They are uncomfortable, but not unbearable. Urges are constant. Urges are time limited. They will pass.
Urges force one to use or act.
I choose to act on the urge. I'll go crazy if I don't give in. I haven't yet and won't. Actually, I will be more emotionally and physically healthy by learning to resist urges. If you have been using heavily, you may experience strong urges the first few days or even weeks after quitting.