Yep and yep.
Yeah, what I eat is important and I haven't found all the links there. Soy is huge for me, wipes my mind out for three days, but my energy takes about a week to recover! Corn sweeteners also do it, but to a lesser extent.

When it's really bad for me, I can't speak straight - like being so tired that I can't put a complete sentence together. Frustrating!

I also can't handle crowds or fluorescent lighting - but those are the ones I know - there are factors I don't know still. This past week or two has been really bad, and I'm really not sure why!!!