What foods can I eat that have no carbs/sugars?

I have type 2 diabetes, but no longer have health insurance or medicine. I cannot eat carbs or even fruit without my sugars skyrocketing. I have been eating a lot of protein and veggies, but I am feeling weak and think I am not getting enough calories. I work out at least 3/week and it seems to be getting harder just to stay awake. I need some healthy, low carb, low sugar ideas to help get enough calories to function properly. Any suggestions would be greatly appreciated! Thanks for your time.