I think most people are caffeine dependent whether they realise it or not. It takes a couple of days for the withdrawal symptoms from caffeine to materialise, so most people never go long enough to hit them. When I gave up my serious caffeine addiction a couple of years back, I went through a dreadful withdrawal period - cramps, aches, bad back, sweats, etc.
It was worth it though, as well as feeling more energetic, I also found I could concentrate a lot better too, as my day was spent fretting about when the next cuppa would lift my in-between cups fugginess. I would recommend it to any one. As for sweets though, not having many is the best option imo.