Depressed feeling

My mind was really unstable yesterday and early morning today. I felt like around my stomach was grabbed by something and didn't have power to do things. I think I was really tired. I woke up around 8am and that strong feeling still remained. But I slept for some more hours and woke up around noon, I felt just ok. When I'm tired, I think the chemical in my brain becomes really strange and affect my feelings. I don't want to be influenced by chemicals too much..

I have many things to do this weekend- -___-