Worried mom!

So I've posted earlier as well...my two year old (27 months to be exact) has been sick since Saturday. It started off with an on again off again low grade fever that reached max 102. I've been giving him children's Advil and Tylenol. Took him to doc on Monday, she said that it may be a viral infection and to stick with the tylenol and Advil for a few days and if his condition doesn't get better then to start antibiotics.

I've been doing that..he seemed better today. He went to sleep at night and woke up suddenly coughing and then vomited! Is this normal? He no longer has fever, just a runny nose and some mild coughing. He's never been sick like this before so i don't know what is normal or not. Please help! He's also not eating or drinking properly. Im mentally and physically exhausted and just wish my baby would go back to being normal. :(

Should I be worried and take him back to doc??