I ve been on Warfarin (alternating between 5 - 6 mg daily) for approximately 3 months. I ve had regular labs to check my PT readings. I ve had radiofrequency ablation in both legs and am finishing up a 3 month treatment with sclerotherapy for multiple blood clots in my legs. Once this treatment is completed I will be taken off the Warfarin. I find that by mid-afternoon I m exhausted. If I sit down with my legs elevated I m out like a light for a deep 2 hours nap. Is fatigue such as this a normal side effect? Also, how long should I wait after getting off the Warfarin before I get my annual flu shot? I m 69 years old. Thank you.