Answers: Nothing--there's nothing wrong next to getting second or third opinions, especially if it's something serious resembling surgery or cancer.
If you are seeing multiple doctors to get the answer you want, later you will have trouble.
What form of doctors are you seeing? If you are seeing specialists for certain reason...that is fine and nobody care. If you are seeing the same big-hearted of doctors then I would ask you WHY? Are you trying to bring back them to write medications? Are you looking for a diagnosis that nobody is giving you? You haven't provided satisfactory information here.