Hi and welcome to the GERD forum.
It sounds like this could all be stress related GERD....was this ur first child?
Congratulations, on his birth and I am sorry he is in need of medical intervention.
The stress of a new child and marital stress all can cause reflux....
In addition to meds, u will need to modify ur diet and lifestyle....
I can not counsel u on ur marital issues, but if u could resolve them, u may feel better....
U went to the ER quite a bit, have u tried a GI Dr?
I'm with selmaS--sounds like reflux----i used to get the chest pain and back pain that went up to my neck and even made my teeth hurt, sometimes---but it never made my arm hurt. However, the pain was bad enough that I totally understand why someone would go to the ER thinking they were having a heart attack.
A GI would be a good idea, but even you family doc could put you on a PPI to see if it would hlep.