Your husband may currently be having some heart problems. He needs to go to ER immediatly. I would call an ambulance and not risk taking him yourself.
I am sorry I could not give you a milder answer.
It may have been some angina symptoms that resolved. I have really no other advice than he needs to go back to the ER. The symptoms as a whole are too suspicious for heart problems.
I wish I could give you an alternate answer. Did they do a stress test or any testing other than baseline bloodwork and EKGs?