Occasional indigestion, 32 year old especially since last 2 months

Since the time I had my daughter (3.8 years back) my digestive system has become weaker. I have had a habit of binge eating since my childhood and I always have felt like eating all the time. I usually eat healthy but occasionally eat food outside. I am 5 feet 6 inches , 62 Kgs. I often eat Sushi that has raw fish. Since the last 2 months I am having on and off issues with my motions on some days its fantastic, once in every 4-5 days it is loose with mucous. I am getting rumbling sounds from my stomach sometimes and i can feel bubbles of gas in my intestine going around. Its like some infection which flares up on days and goes dormant on other days. Sometimes there is a dull pain in my left leg and it goes away when I pass gas. Sometimes there is a dull pain in my lower left abdomen. Its so dull that if I am distracted or too occupied with work i don't notice it, but if i am sitting idle I feel it and then it goes away if i pass gas. Sometimes i get a dull headache after eating. Since its been 2 months now I am getting worried. I have had a tendency to get acidity it used to happen 2-3 times a year when i was 23 - 24. After my daughter was born There were phases when I had episodes of hyper acidity once every month especially on the 3rd , 4th day of my periods. I have had 2-3 days of hyper acidity and headache and nausea in the last 2 months ( which was aggravated because I was travelling to India from US and out in the sun at 47 degrees). I also went to a doctor to check if i had a tumor or something because of the dull ache at times in lower abdomen, he did a physical examination and gave me 3 weeks of strong antacid and sent me back which I did not take. Please recommend a constitutional remedy that can fix my indigestion issues