Hi I actually got a laugh when so many people said their go to is oatmeal, and nut butter on bread with banana, I've eaten many hundreds of those myself! You sound like me with the multiple symptoms, my heart goes out to you. I've had horrible GI symptoms for almost 2 years now. Just had my 2nd abdomen CT with contrast scan, nothing of consequence showed up, have had coloscopy endoscopy, you name the test I've had it...along with GI, also have cardiac arrhythmia, and the heart racing wakes me up at night so my sleep is horrible, Chronic fatigue, now the new insult of nerve tingling and feet numb. I even had my thyroid removed! as my Endocrinologist and Cardiologist were SURE it would cure at least the heart arrhythmia, but NO still have it. After the surgery recently developed the nerve symptoms Why? One thing you can try for your GI symptoms, and I've tried a lot and its not a Med...I've tried meds and fiber and you name it for the GI issues, nothing worked, and I'm nauseous every day most of the time too. I go to a Chinese doctor for acupuncture which helps a little so far for mostly just feeling a bit better for a day here and there, but at least its something and feeling close to normal is a joy, but really disappointing when it goes away again. BUT this might help you and its not any meds, he also recommended a Chinese healing based diet for my endless bowel problem...its a lot of carbs and grains, and a not wonderful watery rice porridge for breakfast and I also have a hot cup of bone broth with that. You can eat only cooked vegetables, and fruit only 2 times a day and NOT for breakfast. nothing can be cold only room temperature or hot, and no coffee or tea for now only hot water. Everything has to be cooked and you MUST have a grain with every meal, NOT whole grain, it can be noodles or cooked grain or can include bread but nothing whole grain. Meat, fish,chicken and only soft spreadable cheese. mIlk ok. NO spices NO pepper only salt and soy sauce. I'm sure you can find a version of it on line its classic Chinese medicine healing diet. Hes not big on probiotics thinks they cause too much gas ( which they do to me ). After only 2 days of it, I had my first day of regular bowels. I could not believe it, he thinks if I can keep this up I'll get more nutrition from what I eat and I'll feel a lot better, I hope so! Worth a try and its not meds that for me so far all have side effects that are almost as bad as the symptom. I'll give you some hope, my sister had this too, not nearly as bad as me, but she is over it after having it for a year. I'm almost 2 years but maybe our bodies will eventually fight back or there will be at least some progress in understanding what covid and sometimes the vaccine has done to people. I was vaccinated 5 times so who knows if that contributed, also had covid once, right after that all my symptoms started UUGH! I wish you well and try the Chinese diet, its the first thing that actually worked for me through all this time.