if you seriously feel withdrawals, this might be something you'll have to ween yourself off of. quitting "cold turkey" could be a disaster.
if you're looking for a better alternative for your chocolate fix, i have been buying these at the grocery store:
http://www.amazon.com/Simply-Lite-Ch.../dp/B0049UDYH8
as you can see, its low carb, sugar free, and has less calories/fat than your standard chocolate bar. i'm a chocoholic and this doesn't taste "fake" to me. it's actually pretty good.
i buy these, and i buy fiber one 90 cal brownies. this may sound ridiculous, but i keep from overeating these two things because i know i will probably have digestive issues if i do. LOL ... i mean, one is known for added FIBER, and the chocolate bar actually says "Excess consumption may have a mild laxative effect."
if that won't keep you from indulging, i don't know what will...lol
as far as your energy..what else have you tried aside from chocolate? and are you taking a multi-vitamin? i take the gummy vitamins because i'm a big dork and i swear they help with my energy. green tea may also help. i also love hot peppermint tea. to me, the smell of the peppermint is refreshing and perks me up.