DS (16 months) has tonsillitis and inflamed ears. Started Penicillin Monday afternoon and I'm struggling to get his temp stable. It's not going below 38.5 during the day and it hit 40.2 overnight. How long do I wait before another Dr appt? He's had so much Calpol & Neurofen over the last 3 days and though I'm trying all the time, what I'd consider the bare minimum of water. He is drinking some milk though.