Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns....
As per your complain pain in throat along with large white patches that can be pus pockets can be due to bacterial infection in throat and taking just one dose of antibiotic
Clindamycin cannot resolve the symptoms..
I would suggest you to continue taking antibiotic an along with it you can take
Tramadol for pain relief as it can relieve
severe pain..
You should also take
Ibuprofen for pain and inflammation..
Do warm saline gargles and chew
Vitamin C pellets..
Do steam inhalations and use a humidifier in your room..
Suck throat lozenges..
Avoid spicy and chilled foods..
Sip on plenty of warm water throughout the day..
In case of no improvement in a a week or if symptoms exaggerate consult an Otolaryngologist and get evaluated..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora..