Help him in seating down
give them glucose, if they have it
If they don't have it, let them consume anything sugary-juice, sugar loaded water, candies
Monitor the sugar levels and If the situation does not improve, call the hospital and ask for an ambulance.
A strain is an injury to a muscle in which the muscle fibers tear as a result of overstretching.
Put a piece of aluminum foil on the chair when you get up
Hypothermia occurs when a low internal body temperature interferes with the body's ability to regulate vital processes, such as metabolism and the heartbeat. One risk for hypothermia is getting wet, which vastly increases heat loss in the cold.