Aura Migraine again, reading comprehension

I have had migraines since about 2003, they got better when I went through menopause. I had 2 bad months from May-June this year, otherwise hardly ever anymore. I had one tonight again, same vision disruption, very little pain but I was reading and wasn't able to understand the words, I had to slowly sound them out, simple words. It did go away and I could read again, it probably lasted about 20-30 min.
This only happened to me one time and that was this past June. I do experience confusion when I get these headaches, but I haven't noticed reading comprehension lose before, not sure if I just wasn't reading anything before when I had one and didn't notice.
I have been under a lot of stress in the last month, and was very stressed when I had this last episode. Like I say I have had slight confusion previous, but don't think I couldn't read words.
Pam