I am new at this so please bare with me. I have been on warfarin since last summer. I had a stable INR (between 2-3) for a couple months & now it has been fluctuating. I went from 2, then 2 weeks later 3 & 2 weeks later (yesterday) I was at 4. I was wondering if this could cause a "spacey" feeling. I have not been feeling great and it seems like I am in a fog or light headed. Has anyone ever felt this way before?