I would run, not walk, to the nearest dr and/or registered dietician. Are you eating dairy products or grains at all? You may not be getting a full complement of amino acids. You have to eat milk products or combine legumes with grains at the same meal (or same time frame). You may not be getting enough B12 without animal products either. I would assume that it is harder to digest and absorb the nutrients in raw foods so you may have some difficiencies somewhere. There are a number of nutrients especially vital for women that can be hard to get in a veg diet. Blurred vision and dizziness are not to be messed with. I would recommend consulting a health professional based on these symptions combined with your activity level, diet and really rapid weightloss. Can you hold off on your next ride until you consult someone?