Hi 1. Since you are a diagnosed case of diverticulitis thus remain under regular supervision of your attending Physician or Gastroenterologist. 2. If you think this weight gain appears to be hormonal or pathological, kindly see an Endocrinologist. 3. As you said that your blood test came normal thus implies that your Thyroid, blood sugar, liver, and kidney reports are in the normal range or get a second opinion. 4. because metabolism does slow down with age so could be age-related, also stress, depression, anxiety, or lack of sleep can make you gain weight. 5. going by your history and symptoms, the most probable diagnosis could be functional IBS [irritable bowel syndrome] which is a collection of symptoms ranging from bloating, diarrhea, abdominal pain, and constipation, fatigue, so consult a Gastroenterologist for necessary examination and investigation [endoscopy, ultrasonography]. Ttill then, maintain proper hydration [to prevent dehydration] and replace with electrolytes [avoid apple, grapes, pear juice which can make stomach upset]. - Avoid fiber-rich diet, since it can make bloating worse [instead take plain white rice, boiled potato, plain toast] - Avoid eating dairy products, spicy food, and spicy condiments, stay away from artificial sweeteners. - Take less of strong spices (ginger, garlic), oily-fried-fatty food and flatus producing foods (peas, beans, dals) - Eat slowly, avoid haste-irregular eating and sweet/heavy food which are difficult to digest and cause indigestion - Since it is a psychosomatic disease thus tranquility of mind is must, as such Medhya drugs or a mild tranquilizer are useful. PS. If symptoms persist, call your doctor since it can be symptoms of underlying illness or infection that require medical intervention. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Munish Sood, Ayurveda Specialist