Not surprising, migraines are brought on by stress. You did the right thing for your kids. It's amazing how it doesn't work out to be rainbows and sunshine with unicorns dancing happily everywhere.
I saw my ex last night at my daughters concert and she just got her hair done. She looked really good. It stung and i am pretty detached. It is so stupid that two adults can't figure out how to make each other happy, meet each others needs and keep the families intact. Who suffers the most, the kids, families and friends.