<s>[INST] The last two nights after eating supper I came down with the chills, then turned into a bad headache and fever, followed by sweating. Both meals were different and feeling ok during the day. Doesn t feel like I m getting a cold, so its becoming kind of scary. I was sick with a head-cold / sinus infection within the last two weeks, but have been taking antibiotics. I m on my last day with no symptoms of relapse. It was a pretty bad cold with a lot of infectious saliva, but that has cleared up. Please help out, I will be making an appointment in the morning, but would like help to get some clarification right now as I sit here sweating. [/INST] HelloAs you mentioned that you are feeling chills , fever and headache , particularly in the night even after different meals on both occasions.So this type of fever may be due to :1 Throat infection or pharyngitis , as this is most common cause because 2 weeks ago you were having sinus infection, so may be the reason of scuh symptoms .2 Urinary tract infection may be the another reason of such symptoms . get in urine examination for any infection.3 Typhoid fever may be the another reason of such case.At present ,you are just going to consult a doctor ,so take tylenol for fever .However , there are so many other reasons of such symptoms but respiratory infection may be the most probable . </s>