Dear Faye: I do hope Simba will reappear soon. If not, you might want to consider consulting with an animal communicator. They can usually tell you if your kitty is still in his/her body and while a cat cannot give you an address or exact location where to find them, they can usually let the AC know whether they are nearby or farther away and describe their surroundings, which can help you find them. There are also meditative stategies you can use to try and draw him back home with your own thoughts. Good luck.
Sally in San Jose