coming back for regurges

skeet regurged on 12/16 from a pinky that was too big for him. before that he was eating really well. I fed him again on 12/28 and he ate it no problem. he fed again on 1/17 and regurged it on 1/19. i gave him a while to recoupe and raised my temps. I then fed him a pink head on 2/3 and again on 2/8, which he kept down. Last night i tried feeding him one of the froazen bodies left over and he refused to eat it. should i continue just giving him heads? He only come out for maybe an hour at night to drink or poop, but he gets active after i hold him for like 10 minutes. he's also really skinny, and i'm starting to worry about him, he never leaves the cold side even when it gets to like 67 at night.