I'd like to welcome you here to the Forum, I'm glad you came. Yes writing down what is happening to you is a hard task, a person can feel helpless, embarrassed, frightens, ashamed and all sorts of things -and all will be wrong. You have done exactly the right thing.
Well a first step I would think should involve a doctor understanding exactly how you feel - in an extended consultation, and at the moment most people can use tele-health with a phone or smartphone or tablet/laptop, to have a consultation. That way even if you can't leave the house, or feel your body is going to betray you while out (I have been that way too and traveled from toilet to toilet) you can still get help.
It may take a few phone calls to find a place, I think at the moment there is even bulk billing on the go -though I'm not positive about that.
Being a single mum is a huge task, and nobody who has not been there will have any idea of the stress, pressure and plain exhausting work involved. You love your kids and do the best you can. No parent can do more.
Can I ask if you have a family member or freind who you can talk to who will simply understand and care? Trying to keep on with all this on your plate by yourself is particularly hard.
You know you are welcome here anytime.