Oh yes, very much so

I had to watch my behaviour all the time because if I didn't my mother would be the one to fall apart and then everyone would be upset and we'd get suicide threats and worse

......

Actually though now I think of it perhaps my fear of falling apart myself is also a fear of becoming her? (not just like her but that she is inside me - when I was a child I had 2 nightmares, one was that she burst into my room at night just screaming uncontrollably - and that was so scary I'd wake up and it would be me screaming)

I think this is what the object relations psychoanalysts call 'introjection'