A few thoughts from someone who quit about 10 years ago.
First, Congratu fucking lations! You quit! That is a BIG GODDAMN DEAL. I hope you appreciate that and celebrate it.
I am very happy that I quit. There is little doubt in my mind that I would be much less healthy now if I still smoked.
Quitting smoking was just the first step on a path to better health. I used the money I saved to buy a Vitamix and a rowing machine. Keep going beyond quitting.
If you must have nicotine do it as safely as you can. I got a prescription for nicotine inhalers. Vaping is better than smoking, etc. If you fall off the wagon, it does not have to be permanent.
Use ANYTHING that MIGHT help you. Rub a worry stone, mastrubate, chew gum, cinnamon oil toothpicks, stress ball, play video games.
The discomfort will not last forever. It will get better.
Best wishes. Keep up the great work!