Congratulations on quitting. Making that decision is never easy. Posting here is a good step. Yes you are the one who has to make the effort, but it helps to have support and it's ok to ask for help.
I think working out is a great idea. It was really helpful in my early recovery. It made me feel good, and exhausted, and I think it helped me sleep better.
Keep posting, there is a lot of wisdom, experience and support in this forum.