Such kind of a chest pain
that u are describing is not classical of any heart disease
. Your family history of diabetes
also has nothing to do with it.
However as you said that the pain is very severe and so painful that u have to stop doing whatever u are and hold your chest, it brings to my mind only one possibility. May be an esophageal spasm.
So kindly do a barium swalloe test and see whether there is this what is causing you such a severe symptoms