Sounds to be that perhas your immune system was down and you got sick with some sinus infection. Since your body is fighting this infection, it is making you tired from trying to help fight off that sinus infection. When most of us don't feel well, many of us feel more sad and down.
You do probably need rest and yes a ice pack may help a head ache. And also we've found what's great for sinus relief is simple head massage by a friend, the area between the head and the upper neck. I hope you will soon feel much better.