Hi.. Can understand your concern.. As per your complain it seems you are suffering from Tonsillitis along with Apthous Stomatitis.. As you are taking penicillin that is an antibiotic and at times antibiotic intake can have a side effect and apthous ulcers or canker sores can occur due to it.. Although the symptoms will resolve once the medicine intake is stopped.. As you still have pain you can start taking anti-inflammatory painkiller like Ibuprofen to relieve throat pain.. Do warm saline gargle, steam inhalation and use a humidifier in your room.. You can chew a Vitamin C pellet daily.. For canker sores you can start gargling with a numbing mouthwash as it will relieve pain in mouth as well as throat.. Salt water gargles will be relieving.. Gargle with 1:1 solution of milk of magnesia and benadryl can be relieving.. Take a multivitamin tablet daily for 15 days.. Avoid hot,spicy and hard food. Drink plenty of water and other liquids to maintain hydration.. In case of no resolution consult your treating physician and get evaluated and he can change the antibiotic or stop the intake.. Hope this information helps.. Thanks and regards.. Dr.Honey Nandwani Arora..