Symptoms which were not in existence prior to staring on warfarin...

I've only been on warfarin 5mg for 2 weeks post-op total hip replacement. I suffer the same side effects within an hour of a dose and it lasts almost up to the next dose. My surgeon didn't want to believe it was the drug's fault. I started taking my temp in the morning when arising, an hour before my next dose, then a couple hours after the dose. The thermometer didn't lie, my temp was lowest in the morning and rose 3 degrees following the dose. It's almost like having the flu every day without the respiratory symptoms.