Thanks for writing to H.C.M. for your query.
I have gone through your query regarding sore throat
with mucus and feeling of lump in throat. I consider all aspect of your complaint and it appears as probably you are suffering from acute pharynx with GERD.
In acute pharyngitis
congested and inflamed mucosa of throat have tendency for bleeding, therefore you got brown colored mucus on spitting.
AS for as treatment is concern you should take-
(a) Antibiotic - Preferably according to culture and sensitivity of throat swab.
(b) Anti inflammatory & analgesic
(c) Mucolytic & decongestant.
(e) Warm saline gargling.
I hope this will help you.