Is it possible for a person having a heart attack to have neck and jaw pain but no chest pain? i also have tmj

Yes: Neck and jaw pain without chest pain would be considered an "atypical" presentation but it does happen. Remember that a heart attack can (and does in 30-50% of cases) have no pain. Other symptoms that commonly accompany heart attacks are: breathlessness, cold-clammy sweat, nausea and sometimes vomiting. Recurring pain is not likely your heart since frequent recurrent heart attacks are unlikely.

DEFINITELY: One of the classic signs to look for in CPR class is jaw pain.

Yes!: Yes, left sided. If concerned call your Doctor ASAP.