Does anyone know?

Lauren • In a relationship: 23/09/13❤️ 16 years old💁🏼
I recently had a kidney infection and since I've finished tablets from doctors I've been getting the same back pains but up all my back and keep feeling like I need the toilet but then never even get to go and needing the toilet a lot more and hurts when I go to toilet both ways... Does anyone know what it is?x