Welcome in H.C.M.
I have gone through your query regarding throat problem and as you said that you have recurrent throat infection
by strep but at present your culture of throat report in not indicating for any infection and you have no pain also.
So i think you are most probably having GERD
, or fungal infection
You are advice for-
1- Warm saline gargling.
3- Vitamines with lycopine.
4- Boroglycerine application over tongue and buccal mucosa.
I hope your query is answered.