James I know how you feel. My father too has heart failure, as well as heart disease, and 80 percent blockage in two arteries to the heart. We was told his heart couldn't withstand the stress of a colonscopy. Good news is that 8 years ago they said he'd only live 4 years it's been 8 and he's still with us thank god!! If you need to talk, I understand just e-mail me and I'll do the same. Just hold in there, god has his plan, he'll take care of it.