Quitting something that has been a big - possibly central part of of your life isn't easy. A lot changes. It takes a bit of time to get used to it. You will find new and better ways to fill your time in due course.
Remember why you decided to quit. Play the tape to the end and think about what the end result of continuing on the course you decided so recently to do something about will mean to you. You have made a start. A little patience now will pay off big time.