penicillin is a good choice but there are many resistant strains of organisms(bacteria).
If it has been more than 48 hrs of antibiotic usage and u have less relief then u can take----considering u an adult above 18 yrs and without any other medical illness----
250 mg two times a day
500mg three times a day
plus three times a day
gargle 2 tsf in 2 tsf water for gargle three times a day
for three days only and report back.