Your symptoms can be due to many reasons. Most of the problems/diseases in throat can manifest with voice change.
As you also have a lump in the throat, first thing that comes to my mind is thyroid. Cancers of thyroid can present like this. They are easily treatable and mostly curable.
hello!! are thyroid disorders ruled out
if so here are some of the symptoms of throat cancer
Changes in your voice, such as hoarseness or not speaking clearly
A lump or sore that doesn't heal
A sore throat
consult ent specialist for further evaluation and treatment.
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