My grandma was schizophrenic, its a terrible thing to have to live with and not just for the sufferer, I was only 15 when she died, but I remember all the late night calls, and the screaming that she was being watched, the neighbours were spying on her, helicopters, awful aful.
My mum was her main carer, although there were 2 other sisters neither were interested and so my mum took the whole burden of it, sounds mean but my grandma wasnt greatful, and really didnt notice much, all your love and effort gets lost in the midst of the turmoil.
Unless your mum takes the steps to take care of herself, by accepting she is ill, she has to medicate, and she has to cope, nothing you do will make much difference. Its such a dibilitating disease, and so misunderstood, but you can not cure her, you can only help her, and to do that you have to help you. Do not let this affect your marraige, because if that breaks down, you will still have the same problems plus heartache. Put yourself and your family first, look after your mum, help her but know you can not fix her.
I am probably not much help, but my family is riddled with mental illness, I have a grandmother with schizophrenia, an aunt her daughter with schizophrenia, a cousin with autisum, a brother with depression, a sister who is not related to my side with ocd, so I have some undersatnding of standing and watching and feeling helpless.
Speak to MIND they are a mental health charity (you probably already know) they will be able to help you with support groups and maybe techniques for coping for your mother, either way you have no control and thats the worst part of mental illness.
Lots of luck