By ALL means get Dr B's book. No, you CAN'T have as much fruit as you want. Dr B recommends not eating any. I have found that I can very occasionally eat berries or melons, but I have them for just a treat and only when I'm having a *very* good day. Oddly enough I've found that I handle them best when they are in season, and can't handle them when they're not--go figure. Are you on Glucophage XR or just the 'regular' kind? If you are having a problem with it causing intestinal distress ask your doc to put you on XR (extended release).
BTW I eat a lot of kale to get my vitamin C naturally, plus I take supplements.