When you quit smoking, how long did it take for the anxiety to subside?

Hi, Ive been smoking about a pack a day for 3 years now. Lately I’ve been trying to cut back/ quit, but when I do I feel AWFUL. It’s not a sick or ill feeling, it’s just a feeling like something should be happening. This is probably just anxiety, I know, but it’s a terrible feeling. How long did it take you to feel normal after you quit? Did you feel any anxiety or something like it?