Pig valve symptoms and conditions

I have been on Warfarin since the end of Aug. 2007 when I had my mitral valve replaced with a mechanical valve. I will be on it for the rest of my life. My doctor.'s all assured me there were no side effects other than the bleeding risks. I now know this is not true. The side effects I am dealing with make me sometimes wish I had chosen a tissue (pig) valve, even though I would be guaranteed another heart surgery within ten years. I am 39 years old and a mother of two young kids. Since being on Warfarin I have experienced various body aches that come on suddenly but don't stay long; extreme hot and cold; itchy hands and feet; dry hair and hair loss; seeing "spots" usually followed by a headache; very thirsty; ongoing bowel troubles, possibly developed colitis; but the worst side effect for me is the fatigue and depression. I feel like I traded in my old self for my mechanical valve. Like I said, I'd have to have a tissue valve replaced eventually, and as bad as heart surgery is, I'd rather have 10 happy years w/out Warfarin than this struggle I deal with almost everyday. My brother is a surgeon and even he buys into the "no side effects" b.s. I work out as much as I can, which used to make me feel great, now I feel like it helps me get by but not the positive effect it used to have on me mentally.