No, money doesn't take all of the stress away, but when you have it in spades you are so much less likely to spend your life having to beg for everything little thing you and your children actually need.
I am fortunate that we are financially solvent. We could afford to buy our own Major for DS2 instead of waiting for months for it. We can afford to replace all the stuff that the boys trash. We own our house and can afford to keep it warm for the benefit of the boy who tends to strip off. We don't have to worry about where the money is coming from on top of the day to day stress of caring for 2 boys with lots of needs.
The boys are in a mainstream school with a good ethos that tries hard for them. It's not perfect, though and DS1 is constantly stressed and has violent rages as a result. I have to pick up the pieces every day.
DS2 is non verbal and has seen a SALT twice since he started reception because his NHS SALT retired and wasn't replaced. They have no input from the ASD advisory team and no training. He is being babysat, effectively, by the devoted 1:1 he is lucky enough to have. He loves his 1:1 and is keen to go to school to be with her, but comes home withdrawn and hits me if i try to play with him. Being in a room with 50 other kids is just plain stressful for him.
DS1 went on the rampage, last week (and has daily, since) and we finally have a meeting with the ASD advisor about him. This meeting was supposed to happen in September. The ASD advisor he used to have left the service in the Summer and wasn't replaced.
The boys can't stand to be in the same room as each other and i really struggle to keep them both entertained and keep them from fighting in the school holidays. We are effectively housebound much of the time. I can't put them in separate rooms because we don't have separate rooms for them and there is only one me to watch them.
I'm afraid that, with a large pot of money of my own, a lot of these problems wouldn't have to be such a big problem. The money wouldn't guarantee happiness, but it would give us a lot more flexibility.