Nasal reflux

Hi, I have a 10 week old who has developed nasal reflux and now she won't eat more then 50 mils at a time while some feeds she won't take any. Once milk spews out her nose she completely quits. She was on a feeding tube when she was born due to her placenta failing and it took 6 weeks for her to get enough muscle and strength to eat a full feed. She maintained 80-100 mls for about a week and a half and then started developing reflux symptoms. Dr put her back on the feeding tube 2 days ago because her feedings kept dropping. She doesn't spit up much, maybe once a day... and she sleeps great. She responds very well to sitting upright. I think she just starts to panic that she can't breathe when milk goes up her nose and then she just quits. She also squirms during most feedings like she's in a lot of pain. We are giving her about a week with thickened milk and seeing if she bounces back, but I'm really worried they will put her on medication and even more worried she will develop a full aversion. I've read a little about Nat Phos 6x and am interested in trying it. She's not quite 8 lbs and she's 19-20 inches long. Any suggestions and advice?