I can't eat any type of food without it bloating my stomache?

it bloats to the point where it's really uncomfortable and I find it hard to breathe if I have to bend. it happens a lot with any bread including: pita, any type of lager, fizzy drinks, pasta, any pastry and even couscous. any idea what it can be? I have been to the doctors and they just tell me to get antacids which do nothing.