Hello and welcome to HCM forum.
Your son is showing signs of mild
hypothermia and has also possibly caught a
throat infection causing the rasping cough .
In homoeopathy you should give Aconite 200 4 pills every half an hour ,and if he starts to feel better within thin 1-2 hours than you can reduce the frequency to 1 hourly .
The other alternate steps that would help is to cover the child well and give hot soups or warm saline gargles .
In case (and mostly after few hours of lack of any treatment ) the body temperature might start rising and then you might need to give the child an
antipyretic like
Meftal -P or
Paracetamol Syrup ,besides the above measures .
For any further queries please use the below link .
www.healthcaremagic.com/doctors/dr-preeti-chauhan/6721
Thanks , hope this helps .