Do people with ventricular tachycardia have a lot of pain?

No/That's a problem! Ventricular tachycardia is one of the most life-threatening abnormal heart rhythms. It can be associated with angina, but I am sure many doctors here have been called urgently to a hospital patient's bedside with v-tach much to the inquisitive look of the patient as they are wheeled urgently to intensive care for more careful monitoring and treatment. So no, not generally, but it is serious.