Welcome to the forum. I suggest you to see a doctor in the emergency room. It is not proper to give any medication without consultation of a doctor or keep an unconscious patient at home. Voltaren
is a NSAID
and can cause circulatory problems leading to acut medical emergency.
At present the patient needs to be clinically assesses in a hospital. He needs to undergo a few blood tests and investigations before being prescribed injections, antibiotics or intravenous fluids.
After the patient is hospitalized, keep him in liquid diet
( soups, energy drinks ). Once he is better you can put him on semi-solid diet like porridges.