@WinstonsWeirdVole
Clearly some posters have never had to try and support a family and run a household/car on a crap/precarious income where you literally don’t earn enough to be able to amass several hundred pounds between periods of sickness
YANBU at all. We need a major reform of sickness pay and wages in general but as a pp said there’s not much chance of that under a Tory government, sadly. Sorry you’ve had a bad time OP 
THIS! ^
@blaisealex I am really sorry your DH's employer won't let him use his holiday leave. I kind of understand why, but that doesn't help you.
I agree with some others that the whole system needs reforming. It's disgusting that a person's wage goes down to less than £100 a week when they are off sick, unless they are 'staff/salaried' or whatever! Everyone should be paid at LEAST two thirds of their 'normal' income if they are off sick.
My DH is in a job like this, (where he only gets statutory sick pay if he's off sick,) And when the kids were much younger (early noughties,) and I was earning less, he was off for 10 weeks after having an operation. We lost around £1700 of his wages over those 10 weeks. It took us about a year and a half to recover from his 10 weeks off.
He had to work overtime whenever he could, and I took on extra hours too - to try and recover the lost income. He spent some years being afraid to have a day off, because we were on such a tight budget. I got paid if I was off sick luckily, but he didn't.
Fortunately, our outgoings are low now, the kids have left home, and I earn decent money. So he can afford to lose a few days here and there if need be, as we have a fair amount of surplus income, and quite a decent amount saved. It took til our late 40s to be in this position though.
But I agree with a few others that some people on here are clueless. MANY people live week to week and struggle terribly financially, and a hit of several hundred pounds lost, can affect them for a long time. And it is NOT unusual for people to have no savings. In fact, some people are even worse off. They are in debt too. With no way out of it, for a long, long time, if ever!
You have my sympathy OP.
I have been where you are and it's fucking hard.