AlmostAJillSandwich I'm really sorry your mum told you that. What we say as parents, occasionally, especially when drunk, is not the full picture.
My dd has autism and mental health issues and at times I've found it very hard.
However, I love her to bits. She is engaging with counselling and getting all the help she can.
Please do not do anything to shorten your life because that would almost certainly devastate your dad. All you can do is engage with any help you can access.
I very much doubt the OP's son knows how she feels. As parenta, yes, we do convey out upsets but also our love.
The OP is reaching out for support here. It's not the same situation as your situation and I think it is important parents can vent in a safe space.
Honestly, as mum to a child with mental health issues I just want her to be as well as she can. The OP really needs solutions to help her and her whole family.
I hope things will be better for all of us struggling with different issues
Please OP let us know how it goes.