no he wasn't scared. he was angry because having edo-madara would put a trouble to his plans. he was probably planning to revive madara with rinne tensei
because he was claiming to be madara and since edo-madara is now on the scene whatever his plans are are threatened. even kabuto don't have faith in him.
he wasent scared he was just shocked that kabuto new about the real madara and he was frightened that kabuto would ruin his plans by revealing the real madara to the public
no he wasn't scared. he was angry because having edo-madara would put a trouble to his plans. he was probably planning to revive madara with rinne tensei
Madara has been dead too long for that. Nagato said he was in time to revive everyone he killed in the leaf village, so madaras body would have been to decayed to revive.