The shaking episode after your most recent long run is worrisome...could be hypoglycemia but it could also be something more serious. Have you consulted a doctor about it?
In general, I try to keep a well balanced diet during marathon training, especially ensuring that I'm consuming enough protein. On long training runs (as above, anything longer than half marathon distance) I bring energy gels to experiment with. During the week leading up to the race I increase carbohydrate consumption. Usually I have a medium sized pasta dinner each of the 3-4 nights leading up to the race, but there are obviously plenty of other carbohydrate options. During the race I usually start my first energy gel somewhere between miles 7-10, and eat it very slowly, generally over the course of 5 miles or so (for me this works better than taking in the whole packet at once). Usually I eat 2-3 packets during the race, which I've found keeps my blood sugar up and keeps me from hitting "the wall".
If I were you I'd experiment with gels on long runs to figure out what works for you, as everyone is a little different! Best of luck on the London marathon! Supposedly the best in the world.
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