Vomitting and indigestion problems baby.

Dear doctor, My baby is 1.8 years old and his weight is 12.3kg on 24th December he was admitted in hospital as he is suffering from diarrhea.. and he gets normal .again on 26th Jan he started loose motions problems then doctor told me to give econorm sachet 2 times 3 days..then again he gets normal...now yesterday night he started feeling uneasy and vomited 2 times at night but morning he is normal also he did normal potty .but after some time a very small dot of loose motions I saw in his panty.. now m very much tensed now...what should I do?? I had given R flora sachet now...but why he is getting frequently problems? What diet should I give? And if again problem starts what should I do now? Pls help me out