The phrase "to help someone feel better" means to do something that makes someone's emotions or physical condition improve or become more positive. Full definition
It takes a bit to get going, but once he fails in his attempts to roll a joint it's the kind of film you can't help feeling good about watching. (firstshowing.net)
This detox salad will really help you feel better in your body. (yurielkaim.com)
That won't help me feel better about the loss. (justarsenal.com)