I'm really worried and need some advice. I've been dealing with strep throat for about a week and a half, and my right tonsil is super swollen. I've also been getting pain in my ear. Last Thursday, they said I had a sinus infection, but they didn't check my throat for strep back then. I just started taking amoxicillin today, two doses so far, but after the first one, I took a nap and woke up with this chest pain on the upper right side when I breathe. Is this normal or something I should be concerned about?

it might be due to gastritis which is a side effect of Amoxicillin.