They do have their own little mojo but since you're already taking about changing it and adding juices then why not juice fasting. There are many wondeful juice fasting fasts that can do you a world of good. Do some research you'll find tons of info on this site and the internet in general

I doubt that sweeteners in general cause eczema. I have no doubt that are many underlying causes related to your overal diet, food combining, lifestyle etc I would suggest that you start looking at the bigger picture of nutrition and cleansing in general to treat the whole person. Nothing in our systems work independantly of anything else.

Good luck