Intermittent fever. 2 of his doses!

I have been experiencing symptoms of headaches, fever(armpit temps of 100-102°F), body aches, weakness, malaise, chills & sweating (both simultaneously). I consulted my Family Doctor of 28 yes(so he knows my medical history right since childhood), and he prescribed the appropriate medicines(to be taken 3 times a day after food intake). I find that once I take the medicines, I sweat a lot, body temp returns to normal, no body aches, increased appetite, and no chills. However 4-5 hrs after the dose, the fever starts coming back. So do the chills, lack of sweat(which is unusual since I sweat a lot even in winter temperatures), partial muscle aches, a little weakness.. This has been the case for the last 2 days(the problem began on Monday, I consulted my GP on Thursday, and have so far taken 3 doses of the medicines he's prescribed). He's prescribed 2 days worth of dosages and I usually recover after 2 of his doses