Hi Mumbomama, you have my sympathy, I used to find childminding a lot harder when my own children were young - when the mindees went home your work just carries on! It can make a difference to change the mix of children to suit your circumstances - do this if it will help.
I hope you don't mind me saying that childminding is a very hard job and you have to keep cheerful and positive, but there are great plus-points too:
your own children will become marvellously socialised by constant interaction with others (yes, including the arguing!)
you can have a cup of coffee whenever you like!
you have no boss or colleagues annoying you
you will develop great reserves of patience!
it's interesting dealing with the different families and watching the children's development
you will have lovely moments with the mindees when they say something funny, learn something new, that make it all worthwhile
it's a tax efficient way of earning money
you can take out a stakeholder pension - I have one with no agent, did it over the internet, and just make contributions when I have the money - the government adds to it when I do
every penny you earn is going to help your own family and children - music lessons, school trips etc
if you get in touch with other childminders you can have a lot of laughs, company and support.
You are doing a very, very worthwhile job
You are not stuck in an office, you keep fit with all that pushing buggies to and from the school run!