While a shot glass may help(mentally), it's not going to cure anything. . .
Too much Vit-D, isn't too much of an issue, unless you have certain immunosuppression issues.
HEAT, can get to you. . . how many hours were you out? I mean, you are a tiny little thing, and if the heat is getting to you, getting cooled down, and taking in some water would be the best advise.
A shot glass, will only dehydrate further. If you are already dehydrated(as 90% of people actually are), and being such a tiny little thing, anything pushing the limits isn't good. Listen to your body, and do what makes SENSE, not what makes you feel GOOD.