Heat exhaustion after effects

Patient: I suffered heat exhaustion on July 4th after a 3 hour hike in 90 degree weather and not enough fluids.After in and out of consciousness and throwing up, I felt better except for a headache.I am continuing to feel the after effects by sometimes being nauseous, hot and weak.I have a history of colon issues and take high blood pressure medication.I have a GI Dr appt but not for 3 weeks. I go see my regular Dr soon but she may not have answers.How long before my symptoms go away and what should I do in the meantime?thank you