very possible. Ammonia should be converted with enzymes into urea for extraction and a build up ammonia is toxic to the nervous system.
Every heart attack is different, so I believe. But it could be just different descriptions from people about the same symptom for all I know. Numb hands & feet, cold tingle, not sure about upset stomach, shacking, all don't sound like a heart attack and in fact the tight chest is the only one that is. I'd assume they drew blood which is probably where they got the ammonia idea. If they drew blood they would be able to tell if you are having an attack right then and there and even if you ever had an attack but since they didn't think so then I'd say you were not having a heart attack.
If you had the symptoms in ER, they would have done an ECG as one of the first tests, this is routine. An ECG isn't the most accurate diagnostic tool, but it would certainly show a heart attack occurring.
How did they rule out any cardiac issue? Did they do an EKG or Echo? They always did with me.
how do you get to much AMMONIA in body never heard of that one.
I think the majority of ammonia in the blood comes from bacteria in the intestines which break down foods we are unable to, or the left overs. The ammonia should be converted by the Liver into Urea. So, I assume the problem would be to do with Liver function.