Wow, sorry you're going through this. A second opinion sounds like a wise choice. Just because she's at Johns Hopkins it doesn't mean a second opinion isn't in order. Smile at your sister and ignore her on this one. Your primary may be able to refer you to another neurologist/neurosurgeon for another look-see.

Even if they decide not to treat it directly, there are indirect things that can be done for aneurysms, like keeping your blood pressure under control, and for blockages, like diet and medication. Your primary may be able to organize all that.

I wish you the best.