Wrist fracture symptoms and conditions

I started coumadin 2 weeks ago, for a clot in my leg. I'm dizzy and lightheaded. I guess I'll be on it for at least 3 months. I've had abdominal surgery and a wrist fracture repaired surgically in the last 6 months and have had breast cancer (surgery, chemo, radiation) 4 years ago. I'm on Arimidex now. All of this is to explain possible underlying causes which I am investigating.

Dizziness seems to occur within an hour of my taking it - in the morning, but subsides by the afternoon. I'm thinking of switching the time I take it to the night - before I go to bed - maybe I can be dizzy in my sleep then and wake up with some sense of normalcy. Any comments?