Talk to General Physician on Neck Stiffness

Hi I am having fatigue since few months which is increasing day by day. I am feeling hungry but cant eat food even cant drink water because of neck muscles stiffness. A burning sensation occurs whenever i chew food/drink water. Arms, hands, feet, legs even muscles around mouth feel this burning sensation whatever work i do. I used to do exercise half hour in the morning and half hour in evening, now i cant even do exercise because of extreme painful situation. I have sleeping disorder too and whenever i wakeup, i am never fresh i feel like i am faint just a little consciousness brings me back to my day. Can i just get to know what might be the issue? Is it some deficiency or serious issue? Thanks