Post covid recovery plan. To some level?

Dear Dr My mother had covid in Dec 2020 She was treated at home with alot of medicines  Since Jan till date she is having severe burping ,flatulence ,feeling of choking in chest  ,acid coming up to chest and throat(cough at times ) and head when excessive acid is built up 1)has v frequent motions .she has IBS and acid reflux both .pre covid also she used to have 8-10  times motions  .stool test ,thyroid and endoscopy test done in April 21  is normal 2) severe burping plz give something which will help with acidity and motions both 3) also she is getting chills 4)since pre covid also she had vertigo and so many meds in Corona her immune is weak 5)she takes temsi am -40 for BP and has Thalassemia minor 6) also lost 10 kgs in last 10 months .also has stress and anxiety to some level