You don't say how long you've been on a low carb diet. You also don't say what you mean by a low carb diet. I assume you mean a high protein diet, but those diets have very little clinical evidence behind them -- for most of history the only people who ate a high protein diet were those who settled in places where plant food didn't grow. They got used to it but didn't live very long, either. When they were conquered, though, and fed a lot of grains, many got diabetes. But if you don't have that particular heritage you might just not be that suited to such a diet. You don't have to eat a high protein diet to slow sugar metabolism, but you probably do have to stop eating sugar and simple carbs that metabolize quickly into sugar upon consumption, such as white flour. It may be you'll do better on the basic human diet, which is a balanced mix of complex carbs, keeping in mind that most veggies are carbs (the main exceptions are seeds, nuts, and legumes, which have a good balance of protein, carbs, and fiber). So you might still not be eating right for you, if diet is the issue and not some other problem.