Oh... umm, it's okay... but umm... I replied much later than you though...
Oh... I see... good luck with your work then... umm, I'm not really fine... no, umm... it's just a little cold... although even a little cold gets worse when you aren't really healthy... but umm, I have felt better after taking some rest and sleep so it's okay...
Umm... I'm sorry for bothering you for something like this...