Pantiene symptoms and conditions

I have been on Warfarin since December 2003 for peripheral vascular disease. I was on the same dosage, 7.5 mg, up until I started seeing a different DR. last year and he upped me to 9.5 mg a day. I noticed I started losing a tremendous amount of hair. Dr put me on prenatal vitamins with no improvement. Hair is very dry and brittle. Have had alot of lightheadedness to the point where I feel I want to pass out but don't, now it affects my driving and work. My head feels like it wants to explode sometimes and have lots of migraines. Anyone else????