Hi, I also have suffered with migraine since about 15 years old. I have two sons aged 11 and 12, and a little girl on the way. With all my pregnancies the migraines have come thick and fast! With my first I also had an incident where I had slurred speach for a few hours, with my youngest I went completely blind for four hours. I was half expecting that I might get one of these symptoms again, but last Tuesday my migraine went overboard! I couldn't talk, move or open my eyes for over two hours, then over the next three I started very slowly getting back to normal, My hubby thought I was asleep, luckily my youngest realised something was wrong. I was rushed to hospital. It was like being in a coma, totally aware but unable to communicate in any way! I saw Drs and a midwife, and the GP the next day. Babies are not effected at all by migraines, however bad, but if you get really stressed, they can feel that. I would go to your GP to be reasured, its a horrid horrid thing to go through and so painful, but baby doesn't feel a thing.
Good luck, hope it clears up for you at some point xxx