As Eileen said, stress is not really a Migraine trigger, but makes us more susceptible to our triggers. Teri Robert did a podcast on stress you may find interesting. Click HERE for more information.
In our forums, we also have a folder, 4 Partners, Families, and Friends that is a wonderful support system for Migraineurs families. To get to the forum, just look for the orange box marked "Manage" and click on the Migraine Forums link. Because our forums are maintained by a third party, you'll need to register for the forum. You can use the same information you used to create your community log-in if you like. If you want to go directly to the forum, you can click HERE.
I know what you are going through--my husband doesn't understand them either. He can't get past the "but it's just a headache" thing. Even though he's seen me puking, unable to walk or see, it's still "just a headache", and he expects me to be able to do things while in full blown migraine like visit his family and play with his 4 and 6 year old niece and nephew... meanwhile, I've got my head in the toilet....
I am thankful that in my immediate family I have a lot of support. Most of the women (my mom, my grandmom and greatgrandmom, aunts, and cousins all get migraines) know exactly where I'm coming from, they've all experienced the hell of a bad migraine.
I can also relate to my husband with not really being able to comprehend the full scope of the pain. Even though as a child and young adult I knew migraines were agonizing and debilitating (I had seen my mother suffer for years), untin you feel that pain, you CAN'T truly know. I've broken many bones (my current wrist break I think is #6... or is it 7?) but the pain of a broken bone is in NO WAY as intense and debilitating as a migraine. I got my first one at 29. In an instant, I knew and understood what my mother went through, and goes through. To think of all the times she felt so horrible, so sick,and in so much pain, but she would muster as best as she could to make sure I got to dance class, to go to family functions, to even do the basics. Wow. It gave me a whole new appreciation of all that she had done, and all that she bore. She's one tough lady!
The other posts refer you to some great resources. The letter on this site is awesome, and does a great job explaining what a migraine is like. (getting the spouse to read it can be difficult...) I think it would also be great for him to read some of the posts here to get an idea of what migraneurs actually go through. MAGNUM is also a great site with lots of information on migraine.
Stress isn't a trigger...but it can definatly make migraines worse! But as far as actually triggering them, no.
I think your husband can pop on here and find any of this useful! Teri has a great friends and family letter that may help him understand too
http://www.helpforheadaches.com/lwfiles/family-mig-letter.htm
http://www.healthcentral.com/migraine/support-162187-5.html
Hopefully I linked this right (linking in share posts is always tricky for me!!
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Good luck!