Same problem, please help. I've got a sprint Note 3 on 4.3 and hotspot is missing from the the settings menu. I've searched XDA pretty exhaustively, and found "solutions" for hotspot, but was barking up the wrong tree. They were to enable hotspot to "work" -- not fix missing hotspot item in settings menu.
Please also let me know if this is fixed with kitkat. I've avoided upgrading but would be worth it if fixed.