Angina diagnosis

Hi, I am relatively young (24) and the only heart "problem" I've ever been diagnosed with is PVCs. I recently had an echo done for them, but it was the lying down on a table echo, not a stress test. My question today is: can angina be diagnosed from an echo test such as this? I ask because I have been experiencing chest pains for about 10 days now. I thought at first it was something to do with my muscles or nerves, because I also feel cold in my chest when it hurts, but since the pain comes and goes I am curious. Would muscular/neurological pain be constant or follow a pattern like I've mentioned? I know angina generally comes with exertion, but my pain happens mostly when I'm sitting sort of slumped (like at a computer) or lying down, especially on my side. Could this be unstable angina? I've also experienced a sort of horizontal "strip" of pain across my back at times. I am probably more worried than I should be, but I would appreciate an expert's opinion. Thank you in advance.

[Cleveland Clinic]

Given your age and symptoms this is extremely unlikely to be angina. If it is cardiac related then it is much more likely to be related to a congenital malformation than to acquired coronary atherosclerosis because of your age.
The reason to have a resting echocardiogram is to make sure that your heart function is normal because if it is then the PVCs have no bearing on you cardiac prognosis.