No details about other complaints if any. As I understand there are repeated incidents of headache, bodyache and fever etc. No other details of 'Sickness' . Although it may not be possible to exactly find out the cause and suggest cure. You should take proper rest, plenty of oral liquids , regular food and pain killer tablets of Acetomenophane / Paracetamol for symptomatic relief. If complaints remain or recur you should see your doctor for a proper clinical examination, related tests , diagnosis and further medications.