I am feeling pain in my both legs, arms and head,...

Your symptoms goes mostly with influenza in which you feel that your whole body and your bones are very painful 
And generalized weakness 
Headache 
Sore throat 
Congested nose 
But if there is diarrhea or recurrent vomiting you must seek emergency department as soon. As possible to rule out
H1n1 or h1n2 S avian flu
In general you need to take 
Vaitmin c to strength your immune system
Hot liquid 
Votrex and dexamethasone injection to give you rapid relief 
Panadol cold and flu 3 times daily 
If there is high grade fever above 39 
And green and heavy sputum. You must take antibiotic too as Clarithromycin on tab every 12 hours for 7 days