15 y.o here having lower right back pain I've been suffering from this since like 10 days my lower back hurts a lot but the 90% pain went away for 2 days after I stared taking medications. But today it hurts again when I bent over to tie my shoe laces I felt like my muscle moved and pain started again . I only feel pain while bending and sitting for more than 25 mins . 

I started lower back pain exercises as well will exercising increase my pain more ? 

How long will it take to fix my lower back ?