If traveling a MedicAlert or similiar braclet or necklace is a must.
Need sugar quickly but also follow up with food with protein to avoid it happening again in a few hours.
When in doubt if sugar is low or high, as some of same symptoms are similiar, give more sugar.
See below for symptoms...
Another option is to put Laminated safety glass in the door instead of standard glass. It is the same as used in windsheilds, may get cracked but very difficult to smash out.