It's common to feel that way. You quit smoking and think, "I don't feel any better. Why bother?"
Who do you tell? Is a pulmonary rehab program near you? Ask your doc, your local hospital or go to the AACVPR website, they know all about pulmonary rehab. Also check my site where you'll find an amazing group of people who have gone through the same thing you're going through right now. Go to the Community page. Don't give up! You are not alone.