When you say "blackout" do you mean you lose consciousness or do you mean you don't remember doing something until someone tells you ?
If it's the latter, then yeah, I think you should think twice about carrying. If it's losing consciousness, go ahead and carry. I don't think any hospital or law enforcement personnel would react poorly in their response.
In fact, when I've been pulled over and I advised the officer I was carrying, all the officer said was, "Don't draw it or I'll have to shoot you.", then he smiled. He never took it away from me, he never even asked where it was. An experienced LEO can tell a turd from a citizen.