Hardcore Panic Attack

I don't know what is wrong with me, but something definitely is.

I woke up today with a really bad headache. I took a shower or whatever and felt fine, I still had the headache but I was feeling a bit better.

Then, out of nowhere, I just started freaking out, and I still really am.

I'm crying and suddenly I'm really depressed, and I don't know what to do. It's scary.