Fever, cld chills, sweat. Help.

I have been experiencing this from last week. The fever is coming and going specially after having a meal. I'm experiencing some weakness and weight loss. Fever mostly stays at 101 and there are chills that happens just before the fever and it happens mostly after having a meal. Once the fever starts getting normal, i find myself sweating like crazy. There is too much sweating. This is happening from last one week and i'm having so much weakness because of this that i have lost more than a kilo in a week. The blood test shows "weak positive" for typhoid, which the doctor that i had consulted rejected it. Whenever i intake any liquid or any solid food, i feel like puking but nothing comes out of the system. I have been consulting a doctor, he has given medicines which i find of no use coz I haven't seen any signs of improvement. Please suggest me of what should i do. Should I continue with the medicines cause its already been a week. I seek your professional help. Thank you in advance