Hello and thank you for using HCM.I carefully read your question and I understand your concern.
I will try to explain you something and give you my opinion.
You should know that typical heart pains have some characteristics. They usually are retro-sternal pains like squizzing , tightness or heaviness. They may irradiate to both arms, neck and jaw and last from 5-20 minutes.
In cases of a
heart attack the pain is very strong and it lasts more than 30 minutes.It might be associated with
nausea,
vomiting,
tachycardia, profuse sweat. A heart attack is a dramatic and acute situation for the heart.It can not last for months.
There are rare cases when a person might experience a heart attack without knowing it.
The pains that you describe for several days, related to arm movement, associated with swollen are not related whith a heart problem. It has to do whith a musculoskeletal problem whith possible inflammation.
Even though my opinion is that you should meat a doctor. It is important to treat this problem and not leave it becouse it might cause other problems if it is an inflammatory process in the meadle.
Hope I was helpfull.Wish your husband good health.
Best regards.