If your blood glucose has been high, your body gets used to that and then it gives a false hypo because it feels low. But 6.2 isn't a real hypo, that's 4 or thereabouts (people have different views on this).
My suggestion would be to take a portable snack with you (eg pork scratchings, nuts), make sure you don't go hours without eating and if you do have a false hypo, don't start stuffing glucose/dextrose tablets. Your body will have to get used to being lower. So I'd suggest something to eat and drink yes, but not stuff that will put your blood glucose way up.
False hypos are horrible I know. But they do go.