hi elisa
i feel your frustration. doctors dont listen.
i've been off PPI's for months now. for a long time i was making do by taking tums, drinking sodium bicarbonate in water, and barley grass water. recently i started taking 'sweetish bitters' (herbal tincture) and much to my astonishment, my heartburn/gerd is almost completely gone. i dont know if this would work for you. i'm wondering what it is exactly that is causing you such horrible ailments.
i've been skeptical of "natural" remedies, but it is really working for me.
along with nessie, i think slippery elm is a good idea. tea and lozenges.
perhaps go to a food nutritionist/naturopath to get tested for food allergies?
are you on any medication that could be causing your motility problem? for example, when i was on wellbutrin, i had a motility problem in my esophagus. there was one spot where large pills would get 'stuck' until i forced it down with a drink. the doc didnt believe me, then they did a barium swallow, and lo and behold - everyone could see the pill sitting there in my throat! that stopped happening after i went off the wellbutrin.
doctors are very frustrating to deal with until you find a good one. i'd recommend you keep looking, dont give up, and try to find a good naturopath as well.