Definitely see your doctor. No one can diagnose you over the Internet. I'm glad you quit that tobacco smoking!

Lung cancer doesn't usually start as a spot that's painful with a deep breath or pressure palpation. That's more likely just muscular pain of some sort or some other sort of inflammation. The one thing that'd be worth checking with the doctor is whether it might be an inflamed lymph node. There are lymph nodes located very close to the area you mentioned, and when they become swollen or painful, doctors do like to know about that. Can you get in to see him a little sooner so you can put your mind at ease?