Should i be taking b-17 after six months of chemotherapy for nonhodgkins lymphoma ?

No. you may be cured: "Vitamin B17" is not a vitamin at all but is a name for Laetril or amygdalin, commonly derived from Apricot pits. It causes cyanide poisoning if taken in enough volume. It was common to hear about it in the 1980s but no studies, either in animal or humans, have ever shown it to do anything significant against cancer. It's like many alternative medications- useless and possibly harmful.