You need a complete clinical examination for determining the correct cause of your symptoms. The few common possibilities of your symptoms are acid reflux/GERD, post nasal drip, throat infection, enlarged tonsils etc. If it is a throat infection it can be viral or bacterial in origin Try doing warm saline gargles. That might help. This is only an advice and not a substitute for medical examination. Treatment will depend on the underlying cause. Keep me posted with more queries. Hope it helped.
Best wishes and regards!