First, rule out suicide.
You should also consult with a qualified attorney and review your options. Legally this may be considered assault, and you could be eligible for damages.
Besides that you need to think carefully about the facts:
• How do you know this wasn’t your girlfriend?
• Did she honestly believe you might be her boyfriend?
• Was it really a kiss, or was she trying to save your life because you were you unconscious & unresponsive?
The only reasonable thing to do is have sex with her. And your girlfriend. Then compare.
I hope this was helpful. If not the moderaters will delete my answer, even if I kiss you.