Oddly when I inadvertantly found myself inside a wreck in zero viz the conversation than ran through my head was almost identical!
I was fortunate in that it wasn't at the same depth so not the same gas worries and I'd already lost my buddy before getting inside so only myself to worry about. In comparison it was a walk in the park compared to your experience but it was still enough to scare the shit out of me.
Glad that you got out safe and that you've got back into the water too.
Now, where's that spare reel got to? I think I might be needing that . . .
Get Tank, Wear Tank, Dive!