My husband all of a sudden got a horrible headache out of no where. When he stood up he got dizzy and has been severely shivering and can't warm up even in extremely hot baths but his skin feel like in fire. After about 2 hours we were able to take his temp and it was 100.7. He was feeling a little better after the bath. He took some nyquil and that helped but temp stayed. Few more hours pass temp rises to 101.7, we had to try to warm him pup again despite him feeling frozen but skin feeling like on fire. Now temp won't go down after more nyquil. What can be wrong with him?