I have had this problem more than 5 years but it has worsened within the last 2 years. I have noticed whenever I have carbs it is alot worse however if I have supplemented myself with iron and folic it is alot less and the gas is alot less. When the abdomen is filled with air i get the shaking palpitating and breathing issues. I lie in a reclined position and burp continuously for half hr then I dont wake up from the vibrations. If I stay away from carbs and take my iron (orofer) and vitamin c and b complex then I have the best week ever and I could have carbs also but not alot and definitely not the last meal. When it get really rough DICA is my rescue. Hope my experience helps. I think many of us have iron deficiencies or mal absorption of iron and just dont know.