I feel like this about work, but not to the same degree, I can keep a lid on it. I am middle aged and it is just the realisation that most jobs are bullshit meaningless ones and that is going to be my lot. I work in the public sector and we are just pushing paper around, earning fairly decent money, not much call to use brain. It all seems pointless. Sometimes when the office is busy and we are all banging away on keyboards I think we are all bonkers, what the hell are we doing! Feel like screaming.
But I don't. I put on my headphones and basically wish my life away. I get huge amounts of flexibility, I WAH a lot, and that is the only thing that keeps me sane and not leaving. I could not cope with a 9-5, Mon/Fri job based at a workplace anymore and that is why I am stuck. If that happened I would also have to go to GP.
Sometimes I try and put myself in others shoes - long term unemployed, factory worker etc - and give my head a wobble. But it is not long before a quiet wave of despair flows over me and I feel the stress of it all again.
I think this feeling is common, and perhaps mid life exacerbates it. When you are younger you have something to strive for, when you are older realisation that you are in a cul de sac is soul destroying.
Sorry, to hijack, also having a bad time of it at the moment.