Hi thanks for asking question.
Here you mostly have viral infection.That lead to such symptoms.
It could be
viral pharyngitis like infection or viral
stomach flu.
You are taking correct symptomatic treatment that is vitamin tablet for tongue soreness and
rabeprazole for acidity.
Viral infection treated symptomatically.Yes rabeprazole can be taken 30 minute before meal also.
Meanwhile maintain your immunity with following measures...
-Drink more water
-Fruits taken more
-Avoid smoking
-Avoid alcohol
-Avoid excess spicy food and fatty food.
CBC can be helpful.
If lymphocytosis-viral
If bacterial-
Neutrophilia present.
If you are not recovering then look for neck stiffness , convulsion , fever with chills to rule out meningitis like condition.Antibiotic can be given for that.
If you are developing chest pain along with this chest x ray done to rule out
pneumonitis like condition.
If you are developing yellow sclera, yellow urine, anorexia, right side abdomen pain then LFT done to rule out hepatitis like condition.
So your aim just now it is take it as viral infection.If symptoms increasing further work up then needed.
Wish you goood health.