I Have Been Waking Up Choking On Bile On& Off

I have been waking up choking on bile on& off since my first pregnancy 10 years ago. Recently it has gotten MUCH more frequent, almost every other night, and it is scary to say the least. I've had a sleep study done, but of course I didn't have a choking episode. I also have a thyroid nodule, Lupus, vocal cord polyp and recently improved congestive heart failure (EF of LV went up from 30-35% to 40-45% now, after 12 months of medications), frequent lympnode swelling in neck and armpit areas. Also newly diagnosed scoliosis. What kind of specialist do I need to help address this specific choking issue?