panic disorde
"Someone who has never experienced a full scale panic attack has no idea how incredibly bad it is. I don't know what it's going to feel like to die, but I'm betting it won't be a lot different from a panic attack. It feels like every part of my body is shutting down, and there is nothing I can do to stop it.  I would do ANYTHING to keep it from happening again. The only medicine my family doctor will prescribe is lorazepam because its slower onset makes it less attractive for abuse than what you get from Valium or Xanax.  
I only take it when I feel an attack is about to happen. In my experience the onset of relief is about an hour from a 1 mg dosing. The relief is incredible, and I seldom need a 2nd dose. No euphoria,  just feel normal."