I had sudden fever for two - three days with chills, headache and severe muscle and joint pain. Five - six days  later had rashes which started from the nose and spread to face, hands and legs which left my face swollen. Then severe  joint pain which made my mobility very less. I had swollen lymph nodes which left pain below my jaw and also severe pain behind my neck below the skull which hurts even when I open my mouth to eat. Still persistent joint pains in my wrists, fingers, feet ankles. Is it viral fever or chikungunya? How can I differentiate it?