I'm 52 and I've been on Warfarin for a year and a half after havi...

I'm 52 and I've been on Warfarin for a year and a half after having a mechanical aortic valve replacement performed in China, with an American titanium valve. I went through some serious episodes of blood thinness, then moved from northern China to SE Asia. 10 months after being here, I continue to work long days, but my energy is all over the place. When thunderstorms come in (daily) I have migraines, but this may be due to head injuries years ago. The main problems for me are up and down episodes of energy, and when the energy is low, I go pale. Pain in my knees and feet when I don't walk enough (maybe an hour sitting), or walk too much (maybe an hour walking) and very rarely what I think is something like aphasia -- the right words don't seem to come out on rare occasions -- maybe too many languages crawing in my head :). I used to walk an hour and a half per day -- not any more. Blood is on the thick side -- surprising because the diet her is very low fat. I want to get back into walking, get my strength back. I also have heard of socks that help in blood circulation. If I had a name or a brand, I could probably find the product in Thailand. Any idea, thoughts? I'm very frustrated.