What you are suffering from is Granular Pharyngitis. The solution is to vaporize the persistent mucosal thickening along the posterior pharyngeal wall that is causing this sensation.
However, I would suggest you do twice daily saline nasal washes(treatment is based on the Neti Kriya borrowed from our ancient and time tested Yoga tradition) for a month before you opt for surgery.
Next Steps
You are welcome to drop into my clinic Healthcare@Basaveshwaranagar in Bangalore for the LASER solution as it is a simple office procedure!