i am 20 yr old. i recently had a viral infection and eventually got severe pain in both the arms specially the shoulders, wrists and fingers, pain in ankles, knees and calf muscles of both the legs. At times, i also have numbness in my right hand and have cough as well. I also feel fatigue and have severe headache all the time. Its been a week since the viral ended but there has been no improvement. What could be the reason for the pain?