My dad just had a sudden drop in body temp. Its now up to 96. But a few hours ago we thought he was having a heat stroke while fishing. Sweating profusely and extremely weak. We cooled him down but then he kept the cold rags on him all the way home with AC on in the car. Now we are wondering if its normal for it to drop so low so quick? He is on blood pressure medication and its 144/102 and pulse 82.