I see that you have started your quit program here. It's good to have a plan. Was your decision to quit planed or a spur of the moment? There is a lot of good information and tips in the forums here. Use the search function to help find answers in the issues you are having. You are probably going to be riding an emotional roller coaster for awhile, until you get used to not having nicotine in your system. As you know, nicotine is a VERY powerful insecticide, I mean drug. 
Have you tried quitting before? If not, you might be surprised to the changes that might be in store for you. Feeling light headed, dizzy, sleeplessness, constipation, hunger, the list goes on. The good thing is they are temporary and will go away in time. 
Don't be too hard on yourself for your failure, but do remember how you feel now for the next time the thought of smoking hits you. 
You know the routine now. Dust yourself off and get back on your quit! 
Hopefully this will be the very last time for you. It's been 2 weeks now and I hope your still smoke free.
I wish you the best on your journey to become smoke free. Keep your guard up at all times, and don't give in. It does and will get easier as time goes by. Be sure and reward yourself on your accomplishments to.
There's going to be a lot of bumps in the road to freedom, but if you're prepared it'll be a lot easier. I see you've started your program, be sure and continue it. You might be able to use it down the road. Getting the blues is common when quitting, along with a lot of other things like being scared, body itching, headaches, cold sweats, coughing, and on and on. Oh, and don't forget about the constipation. That's one thing you hardly ever hear about, but it does happen, and it does last awhile. That too will pass in time. (Pun intended) 
Nicotine is a VERY addictive drug, and when your body no longer gets it's "fix", it starts acting up like a spoiled little brat throwing a fit. 
In time your body will readjust to being able to live without that nasty Nico-Demon. I've been smoke free for about 13 months now. I smoked for 37 years. You can quit if you're really determined to. Stay strong and hang in there.
