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From the picture (attachment removed to protect patient identity), your diagnosis is acute follicular tonsillitis. Usually, this is caused by strep, other bacteria responsible are Hemophilus and Moraxella. Starting an antibiotic at this stage helps in early recovery. As you have been started on antibiotics I would advise continuing that, but only one antibiotic that is Biaxin (Clarithromycin) to be taken after food.
Antibiotics are known to cause gastric upset, which usually gets relieved once the course stops. If this is too much take Zantac (Ranitidine) 150 mg before food twice daily and take warm salt water gargles at least thrice a day. If there is no relief, please follow up after seven days.
For more information consult an ENT otolaryngologist online --> https://www.icliniq.com/ask-a-doctor-online/ENT-Otolaryngologist