My therapist has helped me to see that I struggle when faced with gaslighting because I am WAY more likely to believe someone else's opinion about me, then my own knowing about myself. I "hear" what they say....never considering how much of it is their addiction or their own dysfunction talking.....just taking it on like I do.
In the middle of working on this myself, but it has gotten better for me.
I did it with things told to me about my feelings, job performance, conflict etc.
I apologized a lot also. I still do sometime, but I don't apologize for BEING any more, but for something I said or did. That is a big difference for me.