I'm guessing, possibly unfairly, that you're of the voting group that happily endorsed cuts to services because "we can't afford them". Only now it's coming back to bite.
I sympathise about the lack of SEN provision - but provision can't be magicked up overnight after years of neglect and service-stripping. Hopefully, with new funding coming onstream, the situation will improve as your child goes through school.
Not sure how you're managing to spend £15 a day on the tube home-work-home tbh, given how the fare structure works. Not sure either how commuting 3 hours a day for a full-time job works with a 7yo and a baby, both with significant additional needs, but. You mention a husband, so presume he's in the picture. The advice given to people in far worse economic circumstances is: budget better, get a better-paid job, move to a cheaper area. Sounds glib, tough, and uncaring, and it is. But that's what millions have already been told to do.
The PM isn't responsible for pricing on local transport networks. Nor for prices set by energy and water companies. Nor for mortgage rates set by lenders. All of these are private sector which, according to supporters, is "more efficient". From next year, the government will require energy cos to decouple electricity from gas prices, and as we're now regularly generating large amounts of power from solar/wind, elec prices should start to fall. An obvious thing to do, if you're unhappy with utility costs, is to actively support campaigns for water nationalisation or much stricter mandatory price limits on energy cos.
In another post you wrote: "My house won't sell at a price I can afford to sell it at". A house will sell at a price a buyer thinks it's worth. Your options are sell at a price a buyer will pay, hand the keys back to the mortgage co for repossession or continue renting it out. If you continue as a landlord - landlords are running a business. And businesses pay tax. That tax pays for, among other things, NHS paediatric services and SEN provision. Both of which you are, or wish to, use.