If you want and have another 5g fuzzy mouse you could try to get him to eat again tonight if he acts hungry, but there's a chance it will turn it down. But if you don't have another 5 gram or he doesn't act hungry and it is curled up inside then I would wait till a week from now and try next week to feed something a little bigger around 10 grams. You want to try and get about 10-15 max% his body weight at least for now.
You did the right thing by not messing with it's hide. To mess with the hide really puts them out of the eating mood. But glad for you now that you know you can do it and what worked you can do it again... and again. And I remember the feeling of relief you get when a young ones eats, that hasn't been eating. When I first started I took my snake out of the enclosure put it in with a box with a live mouse. The mouse was bouncing on top of the snakes head. I've learned a lot since then. Thanks in large part to this web site and experience too.