Since you are suffering from fibromyalgia
, your light exercise is good, but you must walk too, to burn your fat.
Have your EKG done on 6 monthly basis to stay in touch with any change taking place in your heart.
Since it runs in your family do a Lipid Profile
once a month.
Take fat free diet and control your weight.
In your age, you have better chance of survival, by avoiding all risk factors.
Hope this will help you out.