Talk to Gastroenterologist on Feeling Of Ball In Stomach

my mother age 71, taking hypertension medicine since 20 years. complaining since six months that some times she feels that a ball stuck in her throat . she then clear throat, with effort spit white mucous out and then she got relief. mostly this feeling after having dinner. she also feels post nasel dripping. one month before fever for one week. now no fever. feel little better after taking anti allergic regix. one GP said its stomach issue. gave her ulcocid. but when she take ulcocid right away she feel ball in throat. she is not willing to take much medicine.please advise us it Silent GERD or ent or what. she is not having any stomach or acidity issue. which doctor to consult. she cant easily ho to doctors place, difficulty in walking due to previous healed leg fracture