What kind of sickness is this?!

What kind of sickness is this?

I feel really odd. My stomache is upset, I've been tired but unable to sleep, and nothing is exciting me. Everything anyone sounds me is just like...blah. Normally I have a great sense of humor and i'm quite outgoing, but I just don't...well I don't feel like theres a point to being outgoing or going out of my way to be happy. Is this a sickness or what? PS, i'm not lovesick because I have a girlfriend and can see or talk to her any time night or day and she'd be thrilled just to hear my voice...

2 weeks ago
I've felt like this for about 5 days. Also in the third or fourth line I meant to say "Anything anyone says to me sounds like...)

You might be worried about something or concerned about something, I have the same problem. I'm worrying about a whole lot of stuff which makes me really tired and I can't go to sleep, just like right now. I took a sleeping pill and I'm still awake because I can't go to sleep but I'm oh so tired. Really can't tell you why you feel that way though, maybe you should see a doctor if you're really concerened about it.