Nasal congestion & Dry tickling cough.

Hi All, My daughter is nearly 3 years old and she is having nasal congestion & dry cough for the last 3  weeks. I have consulted 3 experienced paediatrician in my city and all of them are saying this is kind a viral cough all the kids are having these days and we don't need to worry at all. They all have prescribed mostly the same type of cough syrup i.e. soventus jr./xpect LS JR., anti-Allergic syrup laveta-M/Criz-M and Nasivion nasal spray. I am not sure what to do. I have given all these cough syrups whenever the doctors prescribed it. But still she is having the cough and even though I have given nasal spray, her nose is sounding blocked while she is breathing... But one positive thing is she sleeping properly in night and also whole day is properly active and running and playing.. Please let me know if I need to worry about it. Please guide me.