I am not Lex, but I am at the beginning stages of this experiment, and I plan to go through at least 3 months, unless something major happens, which I do not foresee.
muscle and/or joint pain (almost feels like a pinched nerve)
No, but I got a wicked calf cramp in the middle of the night. I had been craving whole dried anchovies and canned salmon with bones yesterday. Now I know why - Ca, Mg, and/or K deficiency. This is common at the beginning, and long time zcers say it goes away. I plan to make sure I get plenty of bones in my diet, including stocks. In the short term, I will take supplements too. I am committed to teaching taekwondo 4 days a week, and I just can't mess with performance right now. This cramp was so bad my gastrognemius (sp?) is now slightly strained from it.
feelings of reluctance to exercise, like you're heart isn't in it
Never. I have felt like perhaps my energy wasn't high, but my performance never suffers from this. As a woman, my energy cycles monthly anyway. I always feel good about working out. With zc there are no highs and lows. Endurance is great.
dizziness and mild nausea during exercise
I have low blood pressure and can get dizzy from it on occasion. I can get dizzy doing spin kicks on the same leg repeatedly too. I have never experienced nausea.
soreness in muscles you didn't think was warranted
Yes, at the beginning. Your muscles will get stronger eating this way. My son told me yesterday that I look leaner and stronger! Coming from him, that means a lot to me.
increased sweating during exercise
Who knows. I sweat so much anyway, I don't know if I could tell the difference.
The thing that worried me the most was the dizziness. I already wrote this but to repeat I was wrestling in bjj class and felt fine although I was sweating more than usual or more than I thought I should be, then all of a sudden I sat up and got light headed and nauseous.
I would suggest that you wean your way off of carbs. First, strictly avoid all sweet fruits, including berries. Stick with a bit of avocado, olives and greens. Stuff like that, and only once a day. Then reduce further over time. Count the carbs if you must and keep it 20 or lower always decreasing over time.
Have your blood pressure checked. Sounds like orthostatic hypotension, and I have had this off and on my whole life. My bp can be as low as 90/50.