I saw it myself. Did you see it yourself? "I saw it by myself" is not a common thing to say, and does not fit your description.
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GPY It could be understood to mean that you were alone when you saw it, though it is not a great way of expressing that.This meaning could be OK for something like a movie, though:
TitiwangsaJack: I saw it by myself. Keith: Did you see it by yourself?However you word it, Keith's question would be odd. He is questioning what he has just been told.
fivejedjonHowever you word it, Keith's question would be odd. He is questioning what he has just been told.Yeah, that is a good point. The sequence is odd.