Hey Emma. That must be awfully frightening. Blackouts are hell anyway, but this would terrify me. I guess there's no way for you to know, unless you found the Taxi driver and asked him. So sorry. I think if it were me I would try to assume nothing terrible happened, otherwise you may be feeling victimized when you weren't. Wow. Big hugs to you!
The only way I could stop having blackouts was to stop drinking completely. It feels great. I have nine days today, and I am dedicated to never drinking again, one day at a time. And I feel wonderful about it.
My heart goes out to you. I hope you are okay!