I apologize, I forgot you mentioned he was in shed. I'd wait for him to be done with the shedding process before attempting to fee again.
What I do if my snakes are having a hard time shedding is get a tupper ware container with small holes in it so it can breathe and put a couple of wet paper towels in it then put the snake in it, put the lid on it and place it in his enclosure. I'd leave it for 12 to 24 hours and check on him periodically.
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