4 year old cries of reflux pain at dinner nightly

My 4 year old daughter had a cold 6 weeks ago then 1 month ago she and the rest of the family all got an awful stomach virus with lots of vomiting. My daughter developed terrible throat pain and belly pain during the stomach virus and still has them 1 month later. She says "spit always comes up in my mouth and I swallow it". Sometimes she says she's going to vomit and sits in bathroom and cries for an hour. I can sometimes see her swallow the contents back down. She may develop this during the day but rarely. It has been every single night at dinner. She takes a bite or two then grabs her throat and cries. She developed another bad cold 2-3 weeks ago which turned into an upper respiratory infection and ear infection. I did try to treat her homeopathically for the respiratory symptoms but was unsuccessful and took her to pediatrician last week and she has been on amoxicillin for 8 days now. She has now developed another mild cold 2 days ago with symptoms of just clear nasal discharge. She takes probiotics daily and I have given her a few doses of nat sulf 6x over the past week. She had a lot of ear pain last thurs and I gave 2 doses of belladonna 6x which resolved the pain. In December I gave 2 doses of sulphur 30x for exczema. It cleared it right up. She has had various remedies in past for colds and bumps (pulsatilla aconite silica calc carb phosphorus bryonia spongia tosta arnica bioplasma). I am desperate to find something to help her with this daily reflux. She does snack on small things throughout the day. Yogurt, granola bars, graham crackers, cheese, salad (she craves). She used to drink a lot of fluids but since the stomach virus her fluid intake has defiantly decreased a lot. She sleeps well at night. She sucks her thumb. Generally a very pleasant child but this problem is really making her very unpleasant.