you need to get a second opinion and/or go to a specialist. My DD had issues with reflux and we had to go to occupational therapy to get her to eat. She would throw up if certain textures even touched her lips (like scrambled egg or yogurt). She lost weight from 18 months to 2 year appointment and we started her on pediasure.
Occupational therapy helped A LOT but if they are not on meds the issue/anixety will only get worse. My DD would have a panic attack at just the sight of food...even if it was not for her! Toddlers with Reflux can even damage their esophagus and there were kids with feeding tubes at her center because the parents thought "they would outgrow it on their own." If it hurts to eat, they just stop eating and have a negative association!
She now eats almost everything with no anxiety! With pediasure she is now 50% for weight (now we do 80% regular milk and 20% pediasure) but go with your gut. My instinct was telling me something wasn't right and there is a difference between my daughter and just a picky eater.