I am a 35 yo mother of 3 children under 3. One week ago, I experienced the worst headache ever , and unlike anything I had felt before. It came on out of nowhere, no warning..and went away within 20 minutes, after I experienced nausea and shaking as well. Since then, I have no had any headaches. Today I saw my family doctor as a follow-up to something unrelated, I mentioned the headache. He was very concerned and scheduled a CT scan. I thought it was just a precaution, but after some online research I am now terrified it was a sentinel headache . My CT scan is scheduled for next Tuesday, I am thinking of calling in the morning and moving it up...are my concerns valid, could this have a been a warning bleed?