Brweis please keep your doctor informed before making any changes to your diet. I would seek the help of a qualified nutritionist or dietitian in your area for guidance.
Having worked with clients with this issue many times I can tell you to progress very slowly with indigestible fiber foods. Soluble fiber is your friend because it coats the digestive tract with a jelly like substance that can help sooth it.
For using the NutriBullet use the small cup and start with green apples without the peeling, chia seeds, slightly green bananas, cucumber, aloe and coconut water. Stay away from refined and processed foods they irritate the digestive system.
It takes time to get it under control and you can with the right directions. Your local nutritionist or dietitian can help you better.
health wishes Wally Bishop C.N.C.