Hi Sandy,
You are doing the absolutely right thing having the CT angeo, I just had my yearly one done and I was told they have perfected this test and it is almost or as accurate as the traditional angeogram. If there is a problem, this test will pick it up. Sometimes the stress of thinking about all this and your strong family history of aneurysms could be bringing on these headaches. Good luck in 6 days and let us know how it turns out. I am truely sorry to hear of your Mom passing at such a young age and your uncle too, so sad.
Ruthie