Thanks for commenting, everybody.
The other TA had said in her email that she would "definitely" check in with me once her quals were finished. They were scheduled several days ago. I texted her recently saying "Hi. How did your quals go?" No response. I didn't get my hopes up for a response this time, so I'm not feeling too hurt by this. I do find it puzzling.
She seemed so concerned earlier; there was such urgency in her voice when she told me to let her know if there was anything she could do to help. And I had explicitly told her, I had treatment providers I could contact for crises/emergencies. What she could do to help was just have a friendly chat with me once in a while; some human interaction to cut through the isolation. She seemed relieved I had told her a way to help and eager to follow up.
Why ignore me then?
This is why can be so hard to interpret people when they say, "I care about you and I don't want anything to happen to you." Because it often seems I can disappear without many of the people who said such things even noticing, let alone feeling anything about it.
I'll probably look around for a new psychiatrist, but I'm reluctant to leave my current one as he has been one of the best doctors I've ever had for meds management. I'd rather have someone who forgets appointments at times but thinks carefully about my medical history and strategically about medication changes than someone who is always punctual but prescribes haphazardly.
I did make some headway with one of the therapy programs I contacted. Even with insurance, it will be quite expensive (about 1-1.5 months' worth of stipend), but reading about the groups and skills coaching they offer makes me think, just maybe, there's a chance this place might actually be able to help me. There's a strong emphasis on helping people learn to integrate the principles they learn in therapy into their real lives (where situations are more complex and nuanced than examples in a workbook). This is what I have been saying for years is what I need the most. I still need to clear an intake assessment to determine if I'm a good fit for the program.
It sounds intense: 3-5 days per week, 3hr per day minimum. But I can only be in lab part-time for the moment anyway; research labs are just starting to ramp up, but we have to work in shifts to keep personnel density low. So this might be the ideal time to go for it. Especially since I was feeling so ambivalent about whether I'd be able to continue living with this despair past the end of the Spring.