Wanda, I know this is scary.
He could well have angina. This often does not show on an ECG, or on a blood test. To really diagnose " coronary insufficiency " or a lack of blood supplying the coronary muscles, he may well need an Exercise tolerance test. Does he get these chest pains with any exertion? Do they go away with rest?
I'm not saying that this is the cause of his chest pains but it sure could be, rather than any tumours in the lungs. Just another possibility.
Do try not to borrow.............from tomorrow.
Thinking of you,
Tammy

Caregiver/advocate to Husband Kris age 59@ diagnosis
DX Dec '10 SCC BOT T4aN2bM0 HPV+ve.Cisplatin x3 35 IMRT.
PET 6/11 clear.
R) level 2-4 neck dissection 8/1/11 to remove residual node - necrotic with NED
Feb '12 Ca back.. 3/8/12 total glossectomy/laryngectomy/bilat neck dissection/partial pharyngectomy etc. clear margins. All nodes negative for disease. PEG in.
March 2017 - 5 years disease free. Woohoo!