My little boy who is 27 months has had tonsillitis for over a week now?

My little boy who is 27 months has had tonsillitis for over a week now he was given more antibiotics yesterday by our doctor however today all he has done is sleep he is only waking up for a couple of minutes very distressed then going straight back to sleep I’m wondering if I should be worried by this. As he never really sleeps much and he hasn’t had anything to eat or drink since 9.30 am this morning