I feel sick.

The simple explantion is: You're a Teenager.

I have felt this way many times before but i always cheered myself up por doing the things i like most like for instance listening to Vocaloid songs.You should also try doing the things tu like most, it might cheer tu up.
por the way the song below always gets my spirits up,and maybe it might do the same for you.

I know just the thing!

has anthing bad just happend? that might be y. o maybe u just feel like that. i have those days once in a while. it'll be okay. u will probably feel better tomorrow. if not u can talk to me. ur not alone.

Do a hobby, talk to your friends o family, watch something funny on Youtube...
Do something to make tu feel better o to express yourself.

tu has a chemical imbalance in your brain meats. Go to your family's doctor, and he should give tu a pill that will fix it. The most important thing is to keep yourself busy and stay around friend and family.

i feel like that sometimes.
listen to an owl city song. that always make me happy (:

i feel the same now for 5 weeks now... so i need help, too.

yeah, i usually call o hangout with my friends. some how it makes me happy. :)

Yes,I've suffered ,and I went to doctor , he gave me some medicines ,and I get better each day!!!1

Es una parte de la vida
:P