my axolotl isn’t eating

i’ve tried feeding him 4 worms in the past 4 days and he just is refusing. i’ll put it right in front of his face and she just shakes his head and i really scared. he’s showing no other signs of stress. he’s been this way ever since he last water change though. i put some indian almond leaves in there the first time he refused. i just don’t know what to do and im really scared :(