I have Fructose Malabsorption too, it’s one of the hardest diets around. I am also Lactose and Celiac Intolerance too.
Why are you taking omeprazole? I also had heart burn for many years and my Doctor suggested me to start off drinking Aloe Vera Juice, the whole leaf. First rub some on your arm to see if you have a reaction, if not then start with 1/4 cup in the morning and 1/4 cup before going to bed. Do that for 5 days then go to 1/2 cup in the morning and 1/2 cup before going to bed, do that for 25 days. Hopefully you should be cure of that nasty heartburn. Make sure you buy the Lily of the Desert
Preservative Free, Whole Leaf it’s organic too. Maybe you should give up all dairy for 30 days including all cheeses including goat cheese and sheep cheeses. If you don’t feel any bettter than try one more thing give up wheat, barley, flour and rye, if you cannot then switch to organic wheat, rye flour etc. so many sprays on the crops nowadays. Have you been tested for Celiac? If everything fails then find the best, number one Clinic/hospital that specializes in your condition. Good luck