Heres my delema:

Im a theater actress, meaning Im in plays and whatnot. Right now I have the lead in a musical which involves singing, dancing and acting. I've never done a musical before and I found out just how much energy this kind of think takes.
starting tomorrow, I have whats called a tech week. We go to the actual theater (which is huge) and work out all technical things (ie. lighting, props, spacing, sound, etc.) This involves going through the enitre play at least 3 times a day for the next week. Tomorrow Im at the theater from noon - 9pm. and every day after that until the show im there for 6 hrs. each day

Where I need advice is: I need food that will keep my energy up for that long. I have a heart condition which doesnt allow me to take stimulants such as caffine or alot of sugar. Any ideas?

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Yes I do! (no I dont)