I'm a 20 year old female.. and about a few months back I injured my back somehow, I don't know if i pulled a muslce or what but I didn't know it was injured at first and I most likely made it worse by doing my daily actives and the way I was sleeping.. I have a back brace for it and I have been taking pain killers when it really acts up, It's gotten better the past few months to the point I almost forgot I had the back pain at all.. Until i was going down the stairs outside, I missed a step going down and i felt this weird pain throughout my back, I thought nothing of it and then went back inside to take a nap, Now keep in mind I thought this pain was just from my period because it was that time of the month.. But fast forward a few days later and my back is in intense pain, almost as bad as it was a few months ago.. It hurts in my lower back and my upper back, And in my ribs a little bit.. My back is very stiff i've noticed and it hurts to bend over, relief comes when I lay down or sit in a comfortable chair..

I wanted to know something though, is it normal to have back pain causing the stomach to also hurt? Not internal hurting but.. It almost feels as if I have pulled a muscle in my stomach as well, When i cough or sneeze it hurts and I thought at first it was gas pressure because thats what it felt like, Like gas bubbles building up in my stomach, But i took gas medication for it and the pain did not go away.. now I think it has to do with my back pain.

Any advice would be helpful :) I've been feeling really depressed and angry at myself lately.