24 years old, gad history, been experiencing short periods of crushing chest pain, like squeezing heart. Subsides after a min or two. Common?

Anxiety & chest pain. Any type of bodily pains are common in those suffering from anxiety disorder, including chest pain. If you do experience "crushing chest pain", however, you should seek emergency medical care immediately to rule out true cardiac emergency first. If cardiac problems are ruled out, you should then see you psychiatrist for possible treatment modification of your anxiety disorder.
Not GAD. This is not a feature of gad. I hesitate to call them panic attakcs either. Panic attacks are, more or less, a diagnosis of exlcusion. This means that you should be sure you do not have an underlying medical condition first which is causing this - various heart problems, thyroid problems, GI problems to name just a few...