I'm a 22 year old female, to say I'm a bit of a hypochondriac/worry wart woud be an understatement..I have a friend who's just 24 yrs old who passed away two nights ago due to an aneurysm. I'm not worrying and it's causing me so much anxiety I'm losing sleep. I've been suffering from chronic headaches for 2 years, and I had an MRI about 4-6 months ago and it came back normal. My question is; how long does it take an aneurysm to form? I know I'm over analyzing and thinking way too much into it. But I'm losing sleep over it, and I'm really concerned.