You have already finished a course of clav 625. Also you say you do not have any fever, throat pain, cold and cough. So infection is less likely.
Your main problem seems to be something stuck in your throat and occasional heaviness in chest . This is more likely due to acid reflux.
Next Steps
Start with lifestyle changes, like timely food and less oily and spicy food. Antacids will help. Also work of your hydration.
If symptoms are persisting, please consult.