Thank you everyone for your replies and helpful suggestions. After another screaming match at naptime I took him to the drop in clinic as we won't get into our doctor until mid week at best. His ears are clear but looks like he may have a sinus infection, dr said there was thick snot at the back of his throat (he has a runny nose). So, cot is now propped up and the vapouriser is on. He gave us antibiotics as well. Am still expecting a bad night but at least I now know its not entirely teething.