good pillow for neck & back?

hi im 17 and have been having neck and back pain for about 4 years and i dont really know what causes it (iv been to diff doctors n things, no1 knew how to help) but anyway i just want to know what a good pillow would be for neck and back pain & support? my back hurts when i lay or stand and neck hurts all the time (all around besides front)

just say the name of the pillow, where i can get it, and an estimated price please….of course the cheaper the better…but i do need one that helps…Also can u tell me if most people think the are comfy and last a while, i really dont wanna waste my money if i dont even like it =[ thank you!