You are doing so good to almost be at two months of your quit. Be more kind to yourself. You have made a huge change and things will seem out of whack for a while but will get feeling normal again. Just remember if you give up your quit and than get heart or lung problems you will sit around and be depressed with no hope of it getting better. Read this site of others who thought just one would help and were back to thier old habit for years without having the strength to quit again. Those thoughts you are having are lies don't believe them.
Keep going you will be so glad you did.
Annie