Thanks for your question on Health Care Magic. 
I can understand your situation and problem. 
Yes, you should definitely take him to the hospital and get done ecg to rule out heart diseases. 
Left sided sudden onset, midnight 
chest pain in old age (more than 60 years) patient is likely due to 
heart attack. 
So don't wait, take him to the hospital and get done ecg and 2d echo. 
If both are normal than possibility of either gastritis or 
musculoskeletal pain is more. 
So give him 
proton pump inhibitors (antacid), painkiller and 
muscle relaxant drugs. 
Don't worry, he will be alright. 
But first rule out cardiac diseases. 
Hope I have solved your query. 
Wishing good health to your husband. Thanks.