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Hello Nick I'm Dr Chip
How long has this been going on?
Any swollen lymph nodes?
Doesn't sound like mono and GERD wouldn't give you lethargy
It could either be a viral pharyngitis or the flu either of which usually run their course in about 7 to 10 days.
For now I'd suggest oral probiotics and zinc lozenges to help for the time being
Please let me know if you need any more information
No way would I consider any kind of cancer here