I need help, since I can't sleep on my back anymore I put a good pillow down on my bed to lay on my…

I need help,

since I can't sleep on my back anymore I put a good pillow down on my bed to lay on my side I can't lay on my side it hurts now I put a pillow between my knees and on my back helped a little bit but I kept tossing a turning because my sides hurt a lot my ribs hurt everything I only slept 2 hours and don't have the money to spend 50$ on a pillow .. can anyone help ? another pillow that is affordable I just can't get comfortable.