3000 is only like 500 over the normal calorie intake for a male, its a bit much but well, some people have 3000 everyday too.
going cold turkey, didnt expect that to happen.
why not reduce your calorie intake bit by bit, and then fast whenever you feel ready?
if you want to do a proper detoxicating(sp?) fast, then only have water during the fast and the fast usually lasts 21-28 days. never go past a month.
but if you want to do a juice fast, they are just as good too.
id also tell your doctor about this if you plan on actually fasting.
i never did tell my doctor, but i never experienced any serious problems.