Does this sound like panic/anxiety disorder?

I sometimes have periods where I "go crazy." I can't think straight, I get all tense, I begin to cry for no reason, I feel intense panic, I shake, I feel the only way out is to kill myself, I begin to cut or scratch myself, I sometimes hear things, I feel absolutely hopeless, I feel detached, I feel paranoid, I feel confused, I feel I have to "go home" (even when I am home, I find myself muttering this over and over), I get cold, I feel my head might explode, and I am terrified. These symptoms fit a lot like I've seen online for anxiety/panic disorders, but the one thing different is that mine don't happen anywhere anytime. Usually, I'm alone. Only once have I ever felt this way in public and that I can probably blame on the fact that I was incredibly drunk and confused. I know during all of these times that I am simply overreacting to something, and that I should not be acting this way, but I am and I DO feel that way. I feel like I'm going crazy. These times of "going crazy" usually only last a short while. I've never actually timed it, but it lasts less than an hour, I am sure. I am a woman, almost 20 years old, and was diagnosed with clinical depression when I was 12. I am not currently on any medication.

TLDR: I guess my question is, could this be panic/anxiety disorder, even though it usually only happens when I am alone and have had a trigger?