How can i get enough carbs? i am on a grain free, legume free, low starch, dairy free diet?

Get good advice: You need to get with an evidence-based dietician. If your fructose malabsorption was diagnosed scientifically, you already have a reasource in evidence-based medicine. Why you've chosen this very restrictive diet, or believe that you require a certain amount of "carbs" in the first place, would be the first questions to address with a scientific dietician. Stay proactive and keep learning. Best.