Your symptoms sound like the side effects of some medications. Are you taking anything? Prescribed or not. Speak to a doctor, because these sympooms are strange.
Do you feel you are depressed? Is that why you posted this on the depression site? Have you been diagnosed with depression or any other illness? You need to find out exactly why you are experiencing these symptoms.
I felt that way when I was a teenager it was awful my doctors were shoving pills down my throat and none of them seemed to help. A lot of it I found was the medicines they had me on. If you are on any medicines try talking to your Doctor about side effects from the medicine your on it could help if they balance it.
sounds as if you are experiencing symptoms of derealization. does anything specifically "trigger" these symptoms (food, tired, stress etc) or are they constant throughout the day? do you remember when you first noticed these symptoms, was anything out of the ordinary going on in your life?
It's seems like a strange feeling you are experiencing.What has the doc said about it,that is if you have been to the doctor about it I should say.Talk to a professional about this and try to get to the bottom of it because it's obviously affecting your life.