I'm with Journ on slowly increasing your Vit C intake. I take anywhere from 12-20 grams per day (depends on stress levels and what else is going on in my life). I break up my C intake over 4 doses per day, and I take my final dose of Vit C right before I go to bed. It hasn't bothered my sleep at all and I figure my body can use all that wonderful Vit C while I'm sleeping to repair and recuperate.
For the aches and pains and chronic fatigue you may want to check into a candida test, if that comes up negative, try Liver Flushing and colon cleansing.