Shrooms don't change your emotional state as a high or a low, they amplify what you are already experiencing. If you are depressed, stressed, anxious, etc, then I highly recommend avoiding shrooms until you have resolved that state of mind, because you will be in for a very bad trip if you don't.
If however life is good, you are somewhere you feel safe, you are content and/or happy and are in a relatively calm state of mind, then go for it.
Ego-death does not necessarily accompany every shroom trip. It depends drastically on what your experience on the shrooms are. However, you should go in with every expectation you will not be the same person when you come out of it. If that scares you, don't do them. That fear will only be amplified on the trip and then you really might come out a different person at the end, for the worse.