I've had 2 full-scale meltdowns (life-threatening amounts of strain) in as many days, countless "breakdowns" (nonlethal but extremely draining) and my support network is absent. One of them involved a violent outburst, luckily with enough presence of mind to put it into a wall instead of the person next to me.
The person who was supposed to be supporting me had their own personal emergency AS I was just starting to decompress in their arms, and I was literally the only person who could help them, and my values dictate that I couldn't say no, even though it was going to be at extreme personal cost mental health-wise. Having to "be strong" right after multiple meltdowns and aborting the healing process while I'm most vulnerable...If I didn't love them with all my heart I would be very angry and bitter right now.
There's no way that I could have in good conscience asked them to stay, and there was no way to let them go without also sacrificing myself since my van was needed to solve the emergency. Even if my conscience didn't demand it, their role as a support for me wasn't something they would be able to do while under that kind of stress.
I'm seriously considering a stint in the hospital. Part of my disability is that my physical systems tend to take the brunt of any uncontrolled stress due to muscle armoring and spasms.