Hey there Buddy, I'd like to ask you few details about how long have you been having fever and chills? At what time of the day is it increased? Also looking at your report i think though dengue is negetive(I don't know for which test you went with), it is more likely Viral. Which is causing dehydration and thus raised Haemoglobin and RBC count. Thus all your symptoms are explanatory on the basis of my diagnosis. You can always take consultation if you have any more questions