Intermittent pain at side/under breast became more severe with nausea, dizzy, weak, clammy, excessive tiredness. improved but could it be heart attack ?

SEE MD NOW: Can't tell here. Right sided more likely gallbladder, kidney stone colon, duodenal ulcer, referred gyn pain(ruptured cyst, ectopic pregnancy- yes, even at age 49), other. Left sided or central definitely could be heart related, or kidney, bowel, gyn, etc. See nd now.

It varies: Symptoms of heart attack are classically crushing chest pain that radiates into the jaw and left arm. Other symptoms can include pain under a breast, especially if you have nausea, dizziness, weakness or are clammy or tired. If you have any question whether you may be having a heart attack, you should immediately go to your nearest emergency department.