Hi Rochelle,
Congratulations on your new child!
1)What is causing the chest pain - could it be angina?
You are not the typical angina patient (young, no risk factors mentions like high blood pressure, diabetes, family history, smoking, cholesterol), but anything is possible and deserves to be worked up a physicain. A face to face interaction is usually necessary to decide how far to take the work up for chest pains in a young person. Hopefully your physician is addressing your concerns.
2) What does 'Q-wave III' mean (this was on my notes following a recent EKG).
an isolated Q in lead III means very little. It depends on the other leads.
3)What is triggering the tachycardia and is it dangerous to keep having these episodes?
The first step is to document the tachycardia with a monitor (24 hour holter monitor, event monitor, or preferrably a 12 lead EKG). Once its documented, we have a better idea of the cause. The differential is quite broad. More information is required to narrow down the options. It sounds like they haven't started the basic work up yet--I am sure your cardiologist will do that.
I hope you feel better soon and good luck.