Warfarin Sodium and adverse reaction

Been on warfarin about 3 weeks due to an a-fib condition.. Dose is 2.5mg a day. Since starting I cannot sleep, feel very tired and fatigued and slight sour stomach. Doctors say this is due to the a-fib but I don't think so. All I hear from my doctors is no side effects. Hs anyone else experienced these symptoms, and/or is there a website where I can find some answers.

I take 7.5 mg. of warfarin daily, and have been for about 5 years. The biggest problem I have is dizziness, the inabilty to concentrate, vision, and waking up at night, everynight. I am a healthy 54 year old male, and have regular test run twice yearly.

I just started taking Warfarin on December 11, 2006 due to blood clots from surgery. My protime numbers won't go over 2.0, so I'm taking 12 mg and will probably start Lovenox injections. All my life I have rejected taking pharmaceuticals of any kind, and now this. I've told my doctor to get me off these meds asap, but now I have to see a hemotologist. If he says warfarin for life, I'll tell him no thank you. I will not live the rest of my life poisoned. As for side effects, the only thing I've noticed is a fitful night's sleep. I really haven't been that tired. I do get achy, but figure that's from physical therapy from surgery.