Veritas said:

You may have gotten enough protein from the beans/peas in the soup, but it still sounds like your diet was too low in fat.  Add in some healthy oils (hemp, flax, olive, grapeseed, coconut), and some nut butter on your whole grain toast, and you'd probably feel much less hungry & more energetic.

Were you withdrawing from caffeine and/or sugar while on this diet?  That could explain the headache & restless feeling.  It can take a few weeks to stabilize your blood sugar when you switch from a junk food diet to one that is 100% nutritious.  Seven days just wasn't long enough for your system to purge the junk & establish equilibrium.

Check out the links I've posted, plan your diet accordingly, and give yourself at least 3 weeks to detox before you make up your mind about the effects of your diet change.

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Actually yes.  I did this 7 day diet as a detox of sorts.  Lots of fluids and everything else fruits, veggies and everything else I described.  The whole idea was to "purge" the junk.  I'm usually a really frequent, somewhat heavy drinker.  Before that experiment, I ate a fair amount of junkfood(I'd snack on chips here and there daily, pop/with and without caffiene, granola bars(the ones loaded with sugar), sugar cereals/fruit loops, cinnamon toast crunch, etc and whatnot.  I don't eat chocolate or anything, but I'd say there was a good amount of sugar in my diet.

And doesn't alcohol interact with insulin in some way, in a significant way?

I also ate cheese by the pounds....man, i have a cheese problem...sooo good.

So I was drinking every day at the time, so that was hard enough. 

My body was withdrawling on alcohol, sugar, cheese, milk, meat and pretty much everything.  It was a very drastic 7 day change, but was meant to be.  Like I said, I've read that it can be expected for effects such as I experienced to happen within the first few days, but by the 7th day it wasn't letting up

this is why I'm looking to slowly(not ridiculously slow) into a more vegetable and fruits kind of diet.

I rarely drink soda anymore.  I actually really enjoy my fruit juices much more.  I'm not drinking everyday thank god.  But I like to snack on potato chips and I love my cheese(in the past week I haven't really had any though).  So I am making some effort.

I've eaten a lot of meat this week...had a steak 3 nights in a row and it was DAMN good.  But I kind of want to limit myself to one small steak or some fish once a month or something.

Who knows though, if I'm eating the way you and other vegans are eating, 29 days out of the month, I might not enjoy the taste of meat like I do now.  My opinion could change after such a change in my diet.

I do doubt it though, but I won't know until I try