I think I will advise my sister regarding this one, she is asking me about this one so I research and found this. thank you all for providing me this info.

I think you need to visit the doctor, it is one of the best thing to do and never let it go through like that too long or it might have complications that you cannot control in the future.

Yep, most of the time, there is something wrong with the child if he is not on his or her usual routine. Check what is happening, better be, you need to monitor it so your are sure that nothing is wrong with your child.

I think what doppleganger means is you've seen some that looks like you or some you know which is in another place but you've seen him/her in your place doing something but doesn't speak at all. It's like a scary one! Correct me if I'm wrong ok?

OMG, as a new member, it is hard for me to remember all of these, is it a requirement to remember this?