hi
I know this is almost a year since your post.
My experience has been: I has 2 visual field disturbance before the detection of the aneurysm, and I have had 1 or 2 after the embolization of the aneurysm.
I did not know, off course then, at first, what this was, other than that I had had a lot of headaches. I have since been to see a neuro optomologist that confirmed that this visual disturbance, which is called a scotoma, is a sign of an aura before migrane. It has connection with migrane. I also think (personally) that this has conection with aneurysm. The reason for this is that it was this visual disturbance and the head ache that made me go to my optomalogist, he ordered an MRI right away, and the aneurysm was discovered. I have not have this visual scotoma disturbance now for 2 years.
But my headaches has changed pattern to now be like Ice Pick stabbing pain in the head.
All the best