Welcome to QuitTran, Kat.
Prior to quitting for good, I had many short quits like yourself and kept falling for the mindset of "one last smoke or one last pack isn't that big of a deal." Truth is, it is a big deal. As long as you keep feeding your nicotine addiction, you will continue to crave another one. What you have to do is break free of that mindset and to do that, you simply need to not smoke.
It was scary for me at the time as well but it is very doable and quitting smoking is one of the most rewarding things you can do.
As Sazerac posted above, read and learn as much as you can about nicotine addiction. The more you know about it, the better equipped you will be to defeat the addiction.
Read up, post and participate here. The are a lot of informative posts here as well as plenty of fun and games that can help distract you in the early days of your quit. It was a forum like this that really helped me in the early stages of my quit.
Do whatever you need to do as long as you don't light up. The longer you go without a cigarette, the better things will get.
Welcome to the board, Kat. It is great to have you here.