Thanks for posting your query.
As you have VSD which can bother you any time. In VSD you get less oxygenated blood which, in long run it may cause pulmonary hypertension
and reversal of shunt causing bluish discolouration (cyanosis
) and paleness of skin. Oxygen supply to many organs like stomach and intestine may be compromised and elicit pain. Your description suggests your VSD may be getting worse.Avoid stressful physical activities.
You should immediately visit a cardiologist for physical examination and treatment.
Hope it helps.