My daughter is 40 yrs old, took her children to an animal park where you drive around in your car. Developed sudden abdominal cramps, became clammy, has blisters on the palms of her hands, diarrhea, headache. Do you feel this could be an allergic reaction , a bug bite that she is not aware of, dehydration, heat exhaustion? She just wants to take Benedryl and see if it helps.