SEVERE CRAMPS

I have the WORST cramps ever. My lower back hurts and so does my front area. It makes my legs even feel kind of numbish when I'm on my period. I've went to doctors/hospitals and they dont do anything. It gets so bad that i can't walk, all i do is lay in my bed and cry. I feel like i want to throw up. I miss sooo much school because of this. Idk what to do or what will help 😭 S.O.S