DS (3) has had a cough for 2 weeks, has seemed fine in himself just constant coughing day and night. Had numerous covid tests which have all been negative including PCRs. About 2 days ago his cough started getting worse at night and he was struggling to sleep so we took him to the drs yesterday who said it was probably viral, his airways sounded clear so just keep going with fluids etc and it should pass. However since then he has started really burning up, doesn't want to eat or drink, just wants to lie down etc. he's also breathing really fast. Should I just assume he has caught another cold/bug and we are starting from the beginning again or could it be the same bug but getting worse? Not sure there's much we can even do either way but I just feel so sorry for him as he's been poorly with it for ages now