Is this low blood sugar & if so, what should I do?

I have recently changed my workouts and am currently doing an hour ( or a little more) with weights and then doing at least 30 min on the eliptical trainer (aerobic training or fat burning program). My problem is that toward the end of that 30 min, my legs begin to feel shaky, and by the time that I am done, I feel dizzy, shaky, so much so that I often times wonder if I can walk down the stairs to the locker room. I eat something high protein (no carbs) prior to going to the gym and drink 1 liter of water while I am there. Any thoughts on what I can do with my eating to change how I am feeling? Thanks for the input.

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