My dear sisterIf doctors can not Your child cure disease,I would recommend reiki.
Reiki means "universal life energy" and is an ancient healing method that manipulates energy flow in the body. Reiki practitioners believe there is an energy force in and around the body. They believe that there is a flow of energy between the reiki practitioner and the receiver of the treatment. It is thought that reiki releases energy flows and allows the body's own natural healing ability to work.
I'm very sorry too, I don't know how it feels but I feel pain in a way for your son, too...
Spells will not work about that. Reiki will help, although Reiki may take a while... I suggest ask help from Gods and I know some of them that specialise in healing... I know an easy way to contact these (if they desire) and it's not a formal and direct summoning of them... Mail me if you want to know more, I promise I'll do my best to help you.