Welcome in H.C.M.
I had carefully read your query and now it appears that your nasal problem is allergic because culture report is negative for infection.
I am suspecting that you are having allergic rhino sinusitis with pharyngitis
with acute otitis media
No doubt you have taken Nasonex nasal spray, this is an anti allergic but you had got no relief, therefore you should now take these also-
1- Tab Paracetamol
2- Systemic anti-allergic.
3- Anti inflammtory.
4- Steam inhalation.
I wish this above addition to your existing treatment will help you.