Just to emphasize what Liz mentioned, when I start this way of eating, I was about the same weight as you. I ate 100 carbs per day and still lost weight at a pretty good clip. So don't be afraid to increase the carbs if you need to in order to eliminate the shakiness. Once you get down to a lower weight, you can reduce them to get back into a better range. I actually started initially at 150 carbs, then after a couple of weeks dropped it to 100, then to 70. Now I'm in the 35-45 range most days.