I was recently reminded of a tool I use for other medical conditions and realized I will do this for migraine also and share with you all.
Pocket cards and badges/buttons.
For any ailment you can create a pocket-sized card with a brief explaination of condition symptoms and/or needs.
Many conditions have card templates or cards for purchase online.
One source is
These are very handy as quick explainations, or when symptoms prevent you from even being able to explain yourself, and they lend gravitas to the importance of treatment/accomodation you may need.
Hope this helps!