I am so sorry to hear about your situation, I understand the space issue though. You've got our love and support, and I hope your parents continue to support you too despite of their seperation.
Do not downsize too much, keep your most loved fixtures and lamps, otherwise you will likely end up regretting downsizing later on. Keeping a good variety is important, but you can give away duplicates if you feel you have too many of a certain fixture or lamp.
I would super gladly give something from your collection a loving home in my collection, of course, with the possibility of you getting it back in the future if you feel like you want that specific item back. I wouldn't want you to feel regret. The long distance might make things difficult and expensive though, but there is most definetely a possibility

I'll of course pay for the shipping completely, you shouldn't need to worry about anything. Especially not in a situation like yours where things are already stressful enough as they are.
My best wishes goes out to you, may your collection be safe, and may the divorce go well, as well as something like that can go. <3