Some of the posters on here are utter wankers.
Seriously, questioning OP about what has changed in the last year? Wanker! Energy prices have shot up. Food has shot up. Mortgages and rent have shot up for many. Fuel. Clothes. Hell even my children's swimming lessons have increased by 10%.
I honestly don't know if Mumsnet is populated by oblivious airheads who spend their days spending their banker husband's money or by genuinely vile people who take pleasure in knocking people when they are already down.
OP, I'm so sorry this is happening to you. I have ice on the inside of my windows today, something that I thought I'd left behind in my childhood.
It's not your fault. You haven't failed.
I know it's tricky because it's so cold but if you can't get a dehumidifier etc you need to ventilate the house every day by opening the windows for 10 minutes to get fresh air in. Do it when the weather app says it's below 80% humidity. It will help with the condensation.
Only dry washing in one room and keep the door closed and air out if you can with the window.
Make sure the bathroom door is kept closed and again ventilate after showers etc.
Lids on saucepans when cooking.
Wipe down the walls etc each day with a towel.
I hope it gets better for you.