Diabetes Symtoms Questions?

Im asking this questio because im concerend and dont want to end up getting Diabetes. I have an addiction to Sherbert Ice Cream resulting in me eating mive ammounts in a short period of time on the weekedns. I would say a few gallons a weekend and this has been going on for some time . The sherbert is mainly my only sweeet i eat because i dont eat candy much its rare if i eat candy and from times to time i buy kettle korn from my farmers market every now and then .. I just want to know would there be signs of diabetes before going to the doctors and being diagnosed ? and what dp some of you suggest i do to lower my chances while still doing what i do every now and then ? I go to the gym 3 times a week and drink mostly water besides a few diner plates i like to have some fruit juice with . Can some one help me ? ive been thinking and worrying about that for some time and want to find some peace with this .