I want you to know I do understand. I had colon cancer at 17. At that age all my "friends" rallied around me at first but once it became a drawn out thing they were much more interested in their social lives than visiting me. I finished my last year of high school from the hospital. Even though that was over 30 years ago I'm constantly afraid I'm going to hear the "C" word again.
I'm sorry you are feeling so isolated. I would encourage to post about your struggles of both here because the stress of the lung cancer has to impact you MI