I am sorry you are going through this. It really really hurts. That your mom is ill is a rationalization and perhaps a justifiable explanation; but the rationalization and justification feels like dismissiveness to your pain, nay dismissive to your very existence.
Does it feel as though she is treating you as if you don't exist, for whatever reason or mechanism of her distorted perspective?
That was my experience. Cry and I cried alone. Even when my boyfriend broke up with me and I cried for 2 hours within her sight, but she couldn't give me a hug or say anything to me.
You have the right to feel hurt. I don't know if there is anything you can do to change her interaction with you though. You can really only change how you will react, or respond.
I recommend bringing your level of hope and anticipation down to z e r o. Do not expect anything. Try not to swing to far and expect negativity-that's another cess pool in itself. Neutral is what might work best. Then if something good happens, all the better (what a nice surprise); but if nothing happens - then there it is: nothing. There is nothing for you to waste your brain space on.
A positive note is you have indirect permission to cut those apron strings and move on as an autonomous adult. Your lo will not be worse off by the relief of not having to try to understand her either.
The sibling compairsons are wicked. I have 2 sisters and well, let's just say I'm onto the myth that we were all treated equally.
You can choose to just not go there and have a detox plan to recover from any interaction you can not avoid.
Thanks for this thread. I don't know much about bi-polar/manic depressive. But I do know I was emotionally neglected/abused because of it.
If you have not already, the Stately Homes thread may be of service to you-toxic family of origin experiences and recovery strategies.