Definitely it's safe to ask. They're not cops, and although many docs aren't up to speed on the fact that weed is not only mostly harmless (except from a heart-vascular standpoint, sadly) but that it's even beneficial, the ones who often tend to know more about it than others are the ones who deal with neurology and psychiatry, interestingly. I guess that's because they've had more in-depth study in the effects of both substances and diseases on the brain. I'm guessing a doctor at an academic/teaching hospital, if that's what yours is, is going to be even more likely to have some knowledge because he'll be more likely to have immediate access to research.

Definitely check it out. And yes, if you read about aneurysms, you'll see that they're not new developments. They form over long periods of time and they're often vascular weaknesses people are born with. Seriously, if you were in any significant danger, they'd have you in the hospital now. The no-straining/no-excitement/no raised BP precautions you're under are just standard procedure. Good luck!