I have been on Warfarin for three months for a DVT in my femoral ...

I have been on Warfarin for three months for a DVT in my femoral vein. I get some headaches, fatigue, feel cold, tired and have gained weight. I am a fit middle aged male, back at the gym now and cycling. I eat a balanced low fat high fiber diet, but still cannot shift the weight. I have been a depressive for most of my life and although manage without drugs have resorted to Valium to help me sleep, as insomnia has also been a significant side effect. I do not sit around, drink excessively or eat like a pig, so where is the weight coming from? My GP's seems ambivalent and it took five weeks to diagnose my DVT after my complaining about Phlebitis and pains in my groin. Not a happy bunny.