Great news kissy reflux has really opened my eyes to how so many (male' late middle aged / elderly) docs know jack sh*t about baby health and care even less about their pain
many seem very misogynistic dismissing the condition as the figment of silly womens' imaginations. Grrrr makes me so cross!
It sounds like you're onto a good combo there tho if BF you might find that all domperidone does is create lots more poo and a starving baby ( it flushes stomach contents through quicker which can be useful if FF as formula can linger for hours in the stomach) - a day or so on it and you'll know if its helping or hindering.
If that combo isn't working try ranitidine on its own then go for omeperazole and / or diet eliminations. Good luck hon - once you get on the right meds you'll have your baby back to their cute little self within days. It is amazingly quick and wonderfully heartening to see them bounce back.
Now you're on ranitidine thankfully it'll be easier to get omeperazole and to generally be taken more seriously by docs.