get very nauseated when I eat some sugars, not all, not breads, just sugar, I cut out sodas, candy, donuts, all the good stuff, a year ago, still get sick sometimes if I get a sip of sweet tea by mistake, but have cut all these items out and joined a gym, and all I did was gain weight. Had test done, and there is a glucose issue but they did not act like it was anything, so where to next.