Avoiding neck pain

I am meditating now regularly for last 4 months. I always sit in a cross legged position with my head slightly bent down. I started developing a neck pain for last 10 days and it distubs me a lot. I couldn't do a chin up position because if i do it then my forehead part feels heavy after meditation. I tried various positions like chin slightly tucked in, it still puts me under pain. Everything was good but this neck pain now disturbs my meditation. Does anyone experienced it ? Any suggestions for me to come out of it.