Had discectomy would glaucosamine and chiondroitin be any help or wasting my money?

Unknown.: Probably wouldn't hurt, though.

Not sure: There is already limited evidence of glucosamine/chondroitin sulfate for use in non spinal related pathology like knee arthritis and even less so in the case of spinal pathology. I'll be honest if it does help, it'll likely be minimal to small, but alternatively, it's unlikely to be harmful in any significant way(besides your wallet!). Good luck.