Thanks for providing more information.
Well as you describe possible causes may include Pharyngitis, Laryngopharyngeal reflux disease, Muscle strain.
As you have tried self care measures with little relief so I suggest you to consult your regular doctor for a clinical examination for further evaluation.
You should avoid heavy weight lifting, neck exercises for a while.
Take OTC Claritin and Tylenol.
Drink warm liquids.
Do saline or oral betadine antiseptic mouth gargles.
Avoid spicy, fried foods, caffeine, carbonated beverages.
And make an appointment with your doctor as well.
I hope this helps.
If you have any further query then feel free to ask.
Positive feedback and bonus are highly appreciated.