I head that flomax and avodart taken together increase the risk of heart failure. I am on both for 5 years because of BPH. Should I be worried?

Doubtful. There is no compelling evidence that this common combination of medications causes heart failure. Millions of men take both of these drugs together.
I don't think so. Epidemiologic studies generate all kinds of junk. There's no plausible mechanism and I suspect that these folks just go to the doctor more and get their CHF diagnosed .