Hi rainbowpromise, I know you live in Canada but don't know where, but if you live near any major city that has a hospital (unless that is where you checked) should have a Diabetic clinic or a Cardiac unit they should be having classes.
I understand your frustration with everybody knowing what's better for you even if they are not suffering with the illness too, my father in-law and some coworkers where that way, especially in the early years