Why Do I Experience Pain In My Feet And Lower Back When I Masturbate, Given My Sickle Cell Disease From Thalassemia?

Hi, I have sickle cell disease from thalassemia and I am 23 years old. When I masturbate, I feel pain in my feet and lower back I m afraid to have sex with someone Why does this happen to me and why does this not happen to other people? Please help. I am in pain. I need treatment and sermon