Extreme lethargy, exhaustion, difficulty concentrating, occasiona...

Extreme lethargy, exhaustion, difficulty concentrating, occasional dizziness, anguish, headaches after taking Warfarin for 4 months, average dose 7.5 to 8.0mg daily. Doctor and nurse said problems might be due to Tramadol I was taking at same time (for arthritic pain), but when I stopped the Tramadol for two weeks, there was no change. Doctor and nurse said NOT a side effect of Warfarin, but when I stopped taking Warfarin for a week, the symtoms went away and my family saw right away that I was "back to normal". I am very upset that these very distressing side effects of Warfarin are not stated on packaging or by medical profession. I know of two other cases similar to mine in the UK.