I have constant nervousness and cant concentrate. If i ever drink coffee or coke i get intense anxiety. It has been constant for 3 months and started 3 monhs ago with a panic attack which I don't know why it was triggered. I cant sleep, whenever I'm alone or in class it is just constant agitation. Sometimes I daydream of bizarre things but never hallucinate it really is bothering me

[spondiferous]

I have the same thing. Always starts with a panic attack. People keep telling me it's anxiety. I don't buy it for a second. I mean, I'm not saying it's not partially anxiety. But I know it's other stuff as well. In my case I know I also have OCD and that's a part of it too. I can't just forget about what's happening. My mind keeps mulling over and over it, and pulling all this other weird **** into it too.
I have been diagnosed with panic disorder/agoraphobia, along with OCD and PTSD and other things. I don't particularly find any of these helpful but I did for awhile. I felt like because I had some labels I could start identifying myself with others and share experiences and stuff. But I have yet to find that. I can share some stuff, but not all of it.
If you happen to see this (I realize you posted this a month ago) feel free to message me, if you want someone to talk to about it. If your experience is anything like mine, you probably feel pretty isolated with all this stuff.