I went to er 2 times allready from chest pain but passd all my heart check ups. and doc says it could b from anxiety or muscle. by lower pec wat is it?

First eliminate: muscle trauma. Then look at the possibility of panic attacks. This symptom is one of 33 and can be reduced or eliminated by psychotherapy, medication, yoga, or other techniques. Start by looking at your background. Here's a beginning reference on anxiety: http://www.psychologyproductsandservices.com/page2.html

Anxiety: People do sometimes feel like they are having a heart attack when going into a state of panic. The long-term answer is to see a Psychologist expert in treating anxiety disorders. Resolving the original source of the anxiety is best. But also please talk with your Physician about an option medication such as SSRI. They are not addicting, do not change your personality and are a good option

Therapy?: Have you yet tried any form of psychotherapy? Typically, the optimal combination of things to treat emotional issues such as panic attacks, which are common is medication (which, on your best day, is supposed to take the edge off symptoms) but the real gruntwork takes place in psychotherapist's consulting room.