Hi, Karoliin...
There's many threads on this forum about anxiety and quitting. Please do look through them, and make use of the very good research that has been posted. And there's some great tips posted here too.
For me, the biggest help in my quit was my behavioral changes that supported my quit. We get so used to doing everthing with a sickarette in our hands and mouth. We need to practice and actually learn how to live without them now.
Take a new route to work. Re-arrange the furniture at home. Drink tea instead of coffee. (Oh, and the effects of coffee is more potent without nicotine.) The point is, get out of your routine. By breaking your routine, you are altering your automatic responses, including the triggers that lead you to pick up a sickarette. That's how we learn to live without coffin nails.
At the same time, we can pick up some positive addictions. We might choose to take a walk every time the cravings reach a certain level. We might choose to join a gym, or a chorus. (I did both last time, and stayed quit for over two years.) Some have chosen to do knitting. What is it you would like to do with the time and energy you have on your hands now?
Smoking is like an iceburg. We only see the top of it. But, the biggest part of the burg is underneath the water, where we cannot see it. That is our behavioral patterns. And it's these patterns that we have to change to be successful in our quit.
If you do chose to use a quit aide, remember, they are helpful. But, their purpose is to help you while you develop new behaviors that will sustain you for the rest of your life. It takes about 6 weeks to develop new behaviors. So, while you're using any smoke cessation products, be sure to be practicing these new behaviors, or some of your own!
I've used just about everything. But, my favorite is Chantix. I personally do not have any side effects from it.
I wish you well, and I'm so glad to see others posting here! Hope you'll all continue!

And remember to look at the links for anxiety and relaxation techniques. There's some good stuff on the second page, too.
Peace!