Why are you wearing a malnourished stressed to heck hatchling as a bracelet???
You shouldn't be handling AT ALL until he is eating on his own.
This snake has been under constant stress for months. At the pet store it was in a glass tank. Jostled around and handled alot. Petsmart allows pets so idiots where bringing their dogs (predators!) Near the display tank. Then the assisted feeding. Then you take him home. Set him up in another open glass tank. You've been handling and assist feeding. You tried putting the snake in a bag to feed it... of course it's not going to work. Strange environment more handing to get in the bag... too stressed.
You've been given a link with advice that can save this little guy. Twice actually.
Why not follow it?