It is now Wednesday and I felt this way since Sunday. I feel slightly better at other times and a lot better when I take ibroprofen. First off my neck and back of my head hurt and it gives me a headache and is very uncomfortable. no stomach or sinus problems; but I continually cough up greenish yellowish phlegm. I've been sleeping a lot and bed in bed most of the time. when I do get up however, I feel dizzy and weak. I wake up in the middle of the night drenched in sweat and undoubtedly hot with a fever and having to cough yet I shiver from being cold. I don't know what is wrong with me I've been trying to eat here and there and I think I am going to the doctors tomorrow. And I am a 22 year old man. Can anyone identify my problem?