Suggest Treatment For Canker Sores In Mouth With Swollen Throat

I Have 6 canker sore type blisters on the roof of m mouth all in a line they dont hurt but recently i had to go to the hospital for a blister on my uvulia because i couldnt eat or swallow and m throat swole up i took all of my antibiotics and that has gone away but im concerned and i also have 2 on the tip of my tongue