I have a 12 year old boy who generally is very active. We live in Australian - NSW. For the last 4 days he has been having the following symptoms:
- feels hot and cold (high temperature last night)
- frequent feeling of weakness in all limbs
- headaches
- tiredness / no energy
- occasional feeling of dizziness / feeling faint
- no appetite

This has been going on for 4 days? You need to get him in to see a Doctor.
Fever and chills, weakness, not eating, he needs medical attention.