It hurts?

So lately I've been masterbating when I'm not busy. So I don't have any toys so I cleaned my makeup brush and I use that but on Sunday I did it at night and after words it started hurting, then I did it again last night and it felt good for a while but then when I cam I thought of doing it more and then it started hurting. Now during the day it hurts and I'm worried. What's happening?