FOODS TO AVOID DURING EXCESSIVE GAS PROBLEM 

Beans
Intake to too much of beans regularly can upset your stomach and can produce gas. Soaking beans before cooking can go easy on stomach and is good for digestibility.

 Cruciferous Vegetables
Cruciferous vegetables like broccoli, cauliflower and Brussels sprouts should never be consumed raw if you are having gas problem. Better to cook it properly before consumption.

 Processed Carbohydrates
Avoid processed carbohydrates as it can worsen the gas problem, because your body is not recognised to the new additives, and harsh ingredients present in the processed foods.

Dairy
Milk or milk products have to minimised in excessive gas problem especially if your stomach is sensitive towards them. 

Onions
Sulphur producing foods like onions and garlic can irritate stomach during gas problem. try to avoid during this condition.

Fizzy Drinks
The fizzy gas inside your cup should give it away -- refined sugar is also hard for our digestive system to recognize (or even find) any nutrients.