Behaviors like this can absolutely occur with other disorders, or combinations of disorders, and if something like this only happens occasionally, with sensible, proximal causes, then this probably is not even any disorder, just a fairly normal reaction to something extremely stressful.

But when its a repeated, common occurance, and occurs with intensity vastly out of proportion to the signifigance of a proximal trigger, or just without one... yeah this is its own disorder.

Its in the DSM, I literally copy pasted this blurb from the Mayo Clinic's page on it.