Day one of back to breastfeeding event.

My breastfeeding specialist suggested to starve my lo for three days and just give him the boob and lots and lots of skin to skin. He has been breastfeeding and supplementing with formula since birth because he was born hypoglicemic. he is four months old and super healthy now and she said if it wasn't for that she wouldn't have suggested it. he hasn't latched in ten days. this is the ultimate try for him to latch again. im super nervous. im seeing the specialist on Friday. today is day one of the three days. is there any of you who have done something like this? does it work?