It's Saturday, and Jessica is helping her dad fix the roof. They need to lay new shingles on one entire side, and they've been under the sun on black tar paper for 5 hours. It's a toasty 92 degrees outside, but the humidity isn't that bad—only about 40%. Jessica has been drinking lots of water and is wearing light colored, sweat-wicking clothing, but she sits down suddenly feeling like she's going to throw up. Her heart is racing. Her skin is warm and dry with no more sweat. Her dad feels her forehead, and she's burning up. What heat-related illness does Jessica have? How should she treat it?