People with cardiomyopathy typically have what symptoms?

Varies. Often none in the early stages, but chest pain, shortness of breath, fatigue, leg swelling, cough, lightheadedness, palpitations may all be occurring at some point. Be aware though that having one of teh above symptoms does not mean that you have a cardiomyopathy.
See below. Common symptoms of cardiomyopathy are fatigue, shortness of breath (especially with exertion) and swelling of the legs (edema).