Bloating And Excessive Gas Formation, Trying Chapati Instead Of Rice, Unable To Lose Weight. Why ?

Hi, I am 43 years old. my height is 5 3 wt 66 kgs msrment 37-36-41:( . From the past one yr I am experience bloating and excess gas which very uncomfortable and painful. Bloating increases as the day progress and towards night, it is unbearable. I am working as a teacher and am constantly on my toes. I am careful about my food and have almost stopped eating rice and have switched to wheat ( chappati, rawa, lapshi etc) I walk for more than half and hour and do all the household chores myself. I have included lot of steamed cauliflower and salad with raw cabbage and other veggies. My meat intake is very limited yet my weight from the middle refuses to go, I am not losing weight nor inches. I hate to go shopping because the figure in the mirror depresses me as I do not get the clothes of my choice. I have now started maintaing a food diary so that I can monitor what goes inside me. Please Help me to get a desireable and healthy weight.