Dear Sue,
Cardiomyopathy can cause a variety of different symptoms so it is possible the pain is due to the cardiomyopathy or the underlying cause of the cardiomyopathy. There are also many other possible "non-cardiac" causes of chest pain that should not be overlooked.
Gastrointestinal causes of chest pain include
refluxGastroesophageal reflux disease
Gastroesophageal reflux in infants
Hiatal hernia repair
Reflux nephropathy
Vesicoureteral reflux (acid from the stomach washing back into the
esophagusBarrett’s esophagus
Esophageal cancer
Esophageal perforation
Esophagitis
Esophagus
Esophagus and stomach anatomy),
gallstonesAcute cholecystitis (gallstones)
Gallstones
Gallstones, cholangiogram
Kidney cyst with gallstones, ct scan,
esophagealEsophageal atresia
Esophageal cancer
Esophageal culture
Esophageal perforation
Esophageal tissue culture
Gastroesophageal reflux disease
Gastroesophageal reflux in infants
Tracheoesophageal fistula repair - series spasm, esophageal rupture, varicose veins of the esophagus, strictures of the esophagus, tumors of the esophagus and other less common GI problems.
Pulmonary (lung) causes include pneumonia, pulmonary embolus, pneumothorax, pleuritis and bleb rupture.
Other potential causes are aortic dissection, back and spine problems and musculoskeletal (muscle strain, rib fracture, etc.).
Psychological causes of chest pain are common and include panic attacks, anxiety, stress and mental duress.
As you can see the list of potential causes in long and may take a little bit of time to determine the precise cause. Your cardiologist or a good Internal Medicine doctor should be able to work through the potential causes of your symptoms.