I know, I have all the bizarre development questions. Has anyone done feeding therapy for their LO gagging and/or vomiting? What did it involve?

One of our EI therapists is trying to send out an SLP to do feeding therapy because J has been gagging and vomiting daily for over a month now, and he's gone through similar episodes when he was younger. He can't use teethers and can't eat solids and now won't even take his reflux meds because of the gagging.