Oh I've got really big abandonment issues too. They're rather ridiculous. I tend to always expect that people are going to leave though, so while it'll hurt like h*** I'm never really all that surprised by it.

I have a lot of pretend conversations in my head (and a few times in writing) with other people... either the people I want to be apologizing too or the people who I am confused about. Like.. I'll have a billion pretend conversations to go over all the different possible outcomes - including worst-case and best-case scenarios. Honestly, I make myself cry with these silly conversations. But at the end of it, I've expressed my feelings and had various possible reactions from the person... and I likely won't need to express it to them in actuality. If I know it's just me being a bit ridiculous. If it's something I DO need to talk to them about, then well, I'll typically have various responses somewhat sorted out in my head.

That's probably pretty silly... but it helps me.