Welcome. You're in good company here at KTC. Lots (most) of us with very similar stories and backgrounds. Go ahead and post roll over in the January quitter group if you haven't done so already. Posting roll is the price of admission around here, and your absolute solemn promise that you will not use nicotine in any form today. You repeat that process first thing each and every day.
The good news about being on day 3 is that the worst of the worst will be over soon. Stick very close to KTC, post freely, and read as much as you can. Oh, and get as many digits as you can. Your January quit brothers and vets alike will be a vital lifeline for you as you tackle this addiction one day at a time. Do not dismiss or downplay that last part. You are an addict, and you cannot quit alone. The rotted husks of many failed quits from those that attempted to quit alone are proof enough of that. PM me and I'd be happy to give you my digits to get you rolling.
Quit on!