First BP, need some serious help.

[200xth]

He asked me to wait one week before feeding him again even if he showed interest

Regurges normally require a two week wait before trying again. Since your friend shoved tweezers down your snake's throat and pulled stuff out, I would maybe wait an extra week just in case she did any damage or excessive irritation to the throat.

Then start very small with the feeders. At 142g rat pups are the normal size, but you'll need to go smaller than that. Maybe all the way back to a mouse hopper or rat fuzzy.