I also agree with Rose & Kate
More elaboration is needed.
I would say if how your feeling is
affecting your job, personal hygiene, and
any activities that you normally enjoy you should
seek some help for it.
I know how you feel, cause I've felt that way while I attended
both Middle & High school I just felt like blah!
It may be depression but again I'm not sure.
Keep more track of how your feeling if you are still feeling
like this go seek out help. I don't want you to miss out on leading
a happy & productive life.
For myself feeling like you described? I gradually had some terrible
grades.
You go & get some treatment.
Lots of hugs!