Hi. Hope You're Having A Great Day. There Has Been

Hi. Hope you're having a great day. There has been some wierd things happening to me lately.

Here it is:
- Feelings of dissociation
-possible hallucination
-shortness of breath
-forgetting small details and inability to concentrate or focus
-not being able to deferentiate dreams from reality
-extreme mood swings from feeling majorly depressed to overly happy and confident, to mad at everyone.
-I was depressed last week but for the last three days, I've been way too happy, reckless and energized. Last night I woke up at midnight and stretched randomly and lied in my floor for five minutes then drew on my white board, and then fell asleep in my bed at around one. All because I had so much energy but I am still wide awake today.
-I laugh at everything, even death jokes
-I think it's funny to starve myself and/or hurt myself
-sometimes I have sudden urges to do something stupid like throw my phone in the ocean or jump out a window, or even run infront of a moving car.

I'm really nervous about what's happening and I know something is wrong but I don't know what. Do you have any ideas or perhaps of what you think I should do. One of these days I feel like I'm going to kill myself or something. But this is just really dangerous to leave un-dealt with.
Thanks.
--- Cheyenne