As long as you can keep that live mouse in a secure, proper enclosure and offer it food and water it will only be that much of a better feeder in a few days. You'll likely want to wait a few more days at least before trying again.

Pick a night of the week you would like to feed on. Try feeding later in the evening as these are nocturnal snakes and some of them aren't as interested in eating at high noon. Place the live mouse in it's container on top of your snake's enclosure about an hour before you plan to offer it (this is called pre-scenting). Let the mouse run around and the snake sense it close by for that hour, then put it in with the snake. Remember to never drop live prey directly in your snake's face. Place it on the other side of the snake's enclosure, then simply and quietly monitor the feeding. Don't hover over the snake while it hunts. This presents you in the position of a predator and a snake is not as likely to want to hunt and feed if it doesn't feel it is itself safe from predation.

In the interim don't handle this snake other than very basic cage maintenance and make sure it's enclosure is in a low traffic, quiet area of your home.