It's not frowned upon to send 3, especially if they are all strong rec letters! It's also nice to have a back up in case a rec letter doesn't make it to you in time. Speaking for someone who has applied to the program twice, it's okay to be stressed just take it one step at a time! I'm a strong believer of the sayings "everything happens for a reason", "if at first you don't succeed, pick yourself up and try again" and "hardships often prepare ordinary people for an extraordinary destiny." Good luck to you and everyone else who is applying cycle 2!