I hate to sound like a dick, and I know you've been through a lot, but they're just cheap plastic figures.
Collect what you can and if you can't get it, don't worry about it. But you know what? It's becoming clear that you can't shake that mentality. So, as much as you mean to this community, maybe it is best you step away. You have enough to deal with. I don't think you can simply help them and not get sucked in. You don't have that kind of personality. This isn't an insult, nor criticism, nor anything like that. You're clearly a good guy, have a happy life, but are battling demons.
If you keep on this roller coaster of emotions you're going to hit some really low lows, and that's not worth it. They're only plastic toys. If giving away your collection would help, do it. I collected this line of original characters, but one eluded me. It was never on sale, and when it was, it was a 300% markup. Not worth it. The collection lost all value to me, so I simply gave them away, and now I only collect Nendoroids, and I don't need the full set.
I only say this out of respect for you, but maybe you need to shed the past and either move on from this thread or literally only use it as a community and not as a collector yourself.