Mother of a son with cancer. He's in his 40s and apparently it's stage 4. He lives overseas so I can't visit. I feel lost and hopeless

I have just found out that my son has cancer. Not too sure of the full details as yet but understand that it is stage 4. He is in his 40's so not a youngster but difficult to cope with nonetheless. Unfortunately, he and the family live overseas so I cannot visit. I feel lost and helpless. Not a new story by any means, but new to me.