help with my mom stomach condition please!

my mom's had her big stomach/belly for around 10yrs already. she feels pains along the lower area of her stomach whenever she presses it. she eats only a little because she gets full easily. she always complains about feeling bloated. sometimes, right after a meal, she burps and would complain of an acidic feeling coming up her throat. her bowel is always...uhm...watery, and sometimes she 'excretes' 5x a day. i've seen her breathing heavily during sleep and i think its because her stomach's weight is making it hard to breathe (she only snores when she sleeps with her back flat on the bed). and if this helps, her stomach leans to her right.

we've visited an internalist, gastro and her gyne. not one of them could tell what's wrong with her. please, i need all the help i can get, im really worried about her.... thanx in advance.