Thanks for writing to H.C.M.
I have gone through your query regarding throat pain and cough
for last 2 months, you are also pssing black thread like particles in your phlegm.
Your symptoms re favoring for chronic infection either in throat or in chest. Since you have throat pain so some short of infection is likely to be there. You are now advice for these basic test to confirm the pathology.-
(a) X-Ray chest ( P.A.view).
(b) Sputum for C/S, Afb, Fungus.
(c) X-Ray paranasal sinuses
Beside this a thorough examination of throat to find out any local cause as- tonsillitis
etc. After this clinical co-relation with inferences of investigations will one to pin point the diagnosis that lateron may be accordingly plan for treatment.