Hello
Thanks for writing to H.C.M. for your query.
 I have gone through your query regarding running nose ,
sore throat and 
ear infection.
      Considering your problems it is clear that you are suffering from acute upper 
respiratory tract infection with acute 
otitis media. I would like to tell you how this develop, You are having 
rhinitis in the form of running nose which ultimately drained to throat and giving rise to sore throat. From here infection reaches to ear via Eustachian tube. Thus you felt acute pain in ear.
       Regarding management you are advice for these investigations-
          (1) Culture and sensitivity of throat swab.
          (2) C.T. scan of 
paranasal sinuses.
          (3) X-Ray chest   P.A. view.
          (4) Blood - CBC, ESR, blood sugar - F & P.P.
     After this much work and thorough examination your diagnosis will be confirm and accordingly you will be advice for antibiotic, anti inflammatory,decongestant and steam inhalation.
  With Regards.