I don't have many recommendations for either situation, but you're not alone, trust me.

I've had trigeminal neuralgia smack me while crossing a very busy intersection, which is blinding pain that nearly knocks you on your tush. Talk about panic!

Also getting migraine auras when you're out shopping is not fun what so ever!! All you can do is find the safest spot to sit down and just relax, concentrate on your breathing and clear your mind.

That's why I love my pharmacy... they have large benches that you could literally lie on inside and outside of the store, in temperature controlled areas away from business, so if you have an episode you have a sanctuary of sorts. More places need to adopt this!!