It's definitely flu season and it sucks but headaches, diarrhea, puking, and the coughing/sore throat can all be flu symptoms. Which I know because my 8 yo got the whole family here sick, too. x-x Fun times.
Now that you mention it, my mother is also starting to cough lol I, myself, is still coughing, the itchy feeling is persistent but I'm definitely feeling much better than last week so I'm pretty sure that I'm almost healed x'D