My Mother has them all too often.
I find that I can usually just "talk her down" with mere conversation dealing with ANYTHING other than what it was that caused her loss of emotional control, into a state where she can breathe, then put on some classical music, and mellow her out pretty well.
It is something that I personally can't even understand, So I don't have any real useful suggestions beyond that.
When unsupervised, She eats Xanax like a three year old (given the chance) eats candy, with little effect, yet my just being there and talking rationally to her seems to work better than drugs.
Without trying to start any big conflict here, and apologies because you asked for advice, not criticism, as well as showing my medical ignorance and prejudices;
Nonetheless, I think modern society relies way too much on psychoactive drugs... It has been my observation that they cause as many problems as they SEEM to solve.