why do I feel like this

I'm sorry I've been offline I haven't been feeling well I don't know why I'm tired Sore Hungry Depressed It's not that time of the month I don't have any germs I get lots of exercise But yet, I am unwell Is there a hidden germ That not even doctors can detect? Or is it something to do with me And my health? Do I stay inside To avoid germs Or is that the reason I feel this way