hello and welcome to HCM,
You poor thing must be suffering a lot but believe me since i have done more than three thousand tonsillectomy
surgeries, the pain and the ulcer will go away.
The healing usually takes around two weeks to one month. In the meantime you can help with the healing by making sure you eat good healthy diet with lots of green leafy vegetables
also ask your doctor and start an anti reflux therapy for better symptoms control
take care and get well soon!!
Dr Sriram Nathan