Help!

Hello guys I'm scared

For the past two days I don't know what the hell has been going on.

I woke up yesterday depressed and I felt like I wasn't real, I wasn't feeling like I was me, just my mind trapped inside a body trying to get out.

I was all day like this.

Today I woke up the same, I didn't talk to anyone at school, then I got home and was depressed for 2 hours, then all of a sudden I felt very happy and hyper, I was typing really fast and was just a feeling of intense euphoria then all of a sudden everything got dark inside and I felt confused and scared at everything, I've been like this ever since, I burst out crying for over 10 minutes just now and I'm scared, I don't know what to do anymore... My dad snapped at me for something silly and I felt like the world collapsed.

When I'm in the depressed stage I think about what if I was dead would it change anything? Murder, dark things and it scares me to death.

I also don't feel like I'm me, I'm not the same anymore.
I also have anxiety problems (since yesterday)

Has anyone been through this?

I don't know if this will help but here's some things that happened lately:

Unsure if I will pass my year
Got caught cheating
Got 15/60 in maths and 01/60 in economy
Moving houses
Parents are stressy
I will have to do a math work and possibly an economy work over the summer.
I'm scared of my parents recieving my grades.

Somebody help me

Trolls aren't welcome at all!