I had another thought: if you went vegan cold-turkey, there may have been a little detox action. I know for a fact that a body can go through all sorts of weird symptoms while it's getting rid of the stuff it no longer wants--some of the biggest hits are fatigue, weakness, nausea, lightheadedness, and dizzyness.
To get rid of toxins, the body has to take them out of wherever they were being stored (fat, muscles, certain organs) and dump them into the bloodstream so they'll make it to the kidneys, skin, and liver to be filtered out. Whatever's in your blood, you feel (think alcohol) so if there's crap in your blood, you feel like crap. Some toxins can be converted into benign stuff, even reabsorbed by the body. But others have to take the whole journey to be discarded. Saunas are great for getting it out through the skin, deep breathing and rhythmic exercises (running, walking, etc.) are good for getting it out through the lungs via breath. Drinking tons of water assists the body in getting it out through the blood; the thinner the blood, the faster it moves and we all know how copious amounts of water helps the kidneys. And the king of all detox tricks: rest. You'd be surprised how much internal work it takes to cleanse a whole body of something.
If the symptoms are uncomfortable, then scale back your vegan shift if it feels right and go at it more gradually. Otherwise, try drinking plenty of water, stretching, walking, meditating, deep breathing, and lifting weights gently until you feel your old powerhouse self again. It'll happen.
Last edited by Baby Hercules on Wed Dec 07, 2011 11:56 am, edited 2 times in total.