What Are The Symptoms Of Cardiomyopathy?

1 am a 78 year old women, who has always enjoyed good health and who led an active lifestyle. There is a family history of cardiomyopathy. I am I of 11 children. Of the 7 still alive, 3 have cardiomyopathy and have defribrillators. The deceased ones died of the condition, as did my father. I have always felt indeed blessed as I have enjoyed good health. About 2weeks ago, I have experienced tiredness and lethargy and have felt unwell. Especially on arising. I have a strange sore neck at the base of my skull and feel lightheaded and nauseous at times. With the sore neck both of my arms ache from shoulders to elbows. I improve as the day progresses, but my appetite is poor. I take Crestor 10 mgms daily, and Coveram 5/5 daily. I check my blood pressure and it can be quite low at times. Highest reading has been120/68. Am I showing symptons of cardiomyopathy or can you suggest what may be causing my problem. thankyou