The changes involve anyone paying higher rater tax of 40% or more. The 'High Income Child Benefit Charge' HMRC Table. Your personal allowance is currently £7475 and you are allowed to earn a further £35,000 before you would hit the threshold where you pay 40% tax. £42,475 in total. The CB is recovered on a sliding scale so, if one of you earns more than £50,000, it's all recovered back in tax.
You earn well under that number and so does your DH. You won't lose CB.
buy a cheaper house maybe? your on £42000 a year and moaning you cant live without your child benefit why have three kids and a mortgage you can barely afford then. There are loads of people out there living on minimum wage and a mortgage just about scraping by.