To feel like a new person

Definition: to feel completely refreshed and renewed, especially after an exhausting and difficult experience
Grammar form: Verb:  feel-felt-felt

Example 1
Husband: Hi honey!  How was your day at work?
Wife: The store was so busy today because of the long weekend.  I worked 12 hours straight. I am so exhausted that I don’t feel like doing anything.
Husband: Oh no!  Why don’t you go take a long warm bath?  I am sure you will feel like a new person after.
Wife:  Thanks!  That’s a great idea.

Example 2
After Tina broke up with her boyfriend, she was so sad that she stayed home for days. She didn’t feel like doing anything.  In order to take her out of her depression, her friends decided to take her on a short camping trip. By being out in nature and talking to her friends, she felt like a new person again.

Meaning:  to feel like a new person means to feel refreshed and reenergized after you have experienced something unpleasant.  

For instance, in Example 1, the person is exhausted from a long tiring day at work. Taking a bath will make her feel reenergized. She will feel refreshed mentally and physically.

In Example 2, the person is extremely sad at first, but by spending time with friends outdoors, she was able to feel happy again. She wasn’t depressed anymore. This was a feeling that she hadn’t felt in a long time.

https://languagesystems.edu/