Hi
I wear a bracelet from Medic Alert, this organization keeps a file on you so that with one easy phone call they can access pertinent information.
For example I have Ehlers-Danlos Syndrome Type III hypermobility, hardly anyone knows what this is so my bracelet gives the name of my disease, the fact that I have mitral valve prolapse and that I am allergic to steroids. The accompanying card that comes with the bracelet goes more into my medical history and a brief thumbnail on what EDS is as well as any medications that I am using, my health insurance company, my doctors name and phone number and an emergency number.
Its a great service there is an annual fee of I believe 15.00.
When I go to the parks I wear the bracelet and carry the card with my park tickets.
If you would like there web address I can email it to you.
Hope this gives some ideas to you