Tripping would you consider going toyour llocal hospital and asking to see the crisis team. I have found them useful in the past as they specialise in mh.
Maybe you can wait til tomorrow now that you have taken some steps (big steps) forward in getting help. But if you feel worse, or if you phone gp tomorrow and are told no appointments then you should consider them.
I was wary at first as I am terrified of being sectioned, but it's never happened, and they have helped.
I totally hear what you say about motherhood, it's hard and a massive resposability, but it does get (a bit) easier.
I have worked with children with autism for years, and wouldn't want to change that, but bloody hell it can be so hard on their parents/carers. (Not meaning to offend anyone, sorry, but I have had dads, mums, carers literally crying in frustration trying to get help, support and understanding for their children ).
It's hard op, even without the terrible pressure of bipolar. BUT you are looking for help now, things will change, and that is down to you making these first steps. Well done, keep going x