Back pain to the max

Tess • 19. I💙my son! I wouldn't have it any other way❤️ engaged to my wonderful fiancé!
I'm currently 36 weeks and 3 days, and my back is CONSTANTLY killing me, I've tried hot showers, I try to get my fiancé to rub it, I sleep with a maternity pillow in between my legs to help straighten my spine, and nothing is working!! Does anyone have and tips or tried something that helped them. IM DESPERATE!