Yehaaaaaaa, you made it and it was a success. Getting sick was probably a combo of everything. We all tend to let ourselves get a bit run-down over the holidays and we push our bodies until they rebel against us. Also you were exposed to a lot of people; many who may have had a touch of the flu bug that is going around.
It is a good sign the nice man was kind and caring and he likes you or he would not have asked if he could see you again.
If you like him and he calls then say yes if that is what you want to do.