@jeannesf1 I am so sorry that happened to you and you should find a better doctor. You also shouldn't pay for someone who didn't provide service!!!
All of what you said is what I have suffered with.
Try the FODMAP diet at Monash university. (its free). I saw TWO qualified gastro doctors. They were useless. Through the FODMAP and my consumer DNA I realized I was INTOLERANT of dairy. (that fixed the brain fog, and a whole bunch of gum issues!) I also ended up being intolerant of cow casein. I am also intolerant of gluten. Getting rid of gluten and lactose was HUGE. Because I flew under the radar with fantastic eating no one figured out I had become insulin resistant. They have no lowered the A1C score so I popped up as borderline. I demanded medication. My doctor is sweet and gave me Metformin. Well, that fixed a ton of things - the fatigue, the severe hunger and evened me out. Going on Allopurinol fixed the largest problem of whole body inflammation after opening something as small as a pile of mail! I went on hormone replacement (very very low doses compounded) and honestly I feel like a million bucks. Better at 69 than at 30. I believe my fibromyalgia diagnosis was tied to untreated gout inflammation. I lowered my triglycerides/cholesterol by eating less "white" stuff - white pasta, white rice, white bread, white potatoes in favor of brown rice, rice/quinoa pasta, (orowheat seeded) bread, red potatoes. Dropped the Triglycerides 85 points in 3 months! Same with cholesterol - by eating MORE FISH. For the first time in my life I haven't had cavities since I gave up the lactose. Its been 7 years! My gums are so much healthier too. The FODMAP will help steer you in a great direction, especially if you have digestive issues. BTW, I do eat diary - just NO LACTOSE (like greek yogurt has it skimmed off) mozarella balls, munster cheese, aged aged aged cheeses!) I definitely eat wonderfully and feel so much better. https://www.monashfodmap.com/