Some of my answers selected as best from January 2016 to May 2016 got deleted automaticaly . Can I view them again.?

That can happen if your answers were reported as violations and deleted or if the question was a violation and was reported. If it was your answer that was in violation you would get an email notice and your answer would be there and it would show a points loss. If no notice or points loss it would be the question being deleted.

If you remember what the questions were you can try a Google search and may find the cache of the question with your answer on it.

They were probably reported try appealing