Update

[vvvexation]

I'm a little saner now. The phone's finally working again and I've made good use of it; I've still got work piling up that I'm in no condition to do, as I'm still not getting decent sleep and I'm now having problems with arrhythmia on top of that, but at the moment I seem to be done panicking about it, or at least to be in a momentarily quiet space between panics. And the interpersonal drama I vaguely hinted at seems to have concluded; I'm still reeling from it and will probably never completely get over it, but as there's nothing more to be done about it I can at least begin to get as much over it as I'm ever going to.

Thanks to everyone who expressed sympathy. Mucho hugs to emmett_the_sane for being there during the panicky bits and to deyo for providing a shoulder to cry on afterwards.