(1) feel (like) oneself意为“感到心情好、情绪正常；感到身体舒适，感觉正常”。

• After a time, she lost her nervousness and began to feel (like) herself again.
  过了一会儿，她不紧张了，开始感觉正常了。
• I don't feel like myself today.
  我今天感觉不舒服。

 (2) look oneself意为“看上去身体健康如常，看上去很正常的样子”。

• Jane had had a long illness, but now she looked quite herself again.
  简病了很长时间，但现在看上去又很正常了。
• She doesn't look quite herself today. What's wrong with her?
  她今天看上去很不对劲，出什么事了？