Hi welcome to HCM... Your CT scan normal ... So don t worry about that .... Here your headache is because of constipation or viral stomach flu.... Drink more water. ... Take fruits more ... Fiber food more like whole grain , wheat bran , apple, carrot etc. .. Take psyllium in hot milk for few days which is stool softener and will relieve your constipation ... Simethicone for gas can be taken..... Avoid high fatty meal .... Gas forming food like cabbage, cauliflower , onion restricted. .... Avoid stress ..... Eat slowly ..... If no improvement USG abdomen done . Hope your concern solved ...