At 34 I left my 'on paper' great HR job, great benefits, pension, salary etc and set up my dog walking business.
I had about 8k saved up to help cover the start but within 3 weeks I was full up and close to my previous salary.
I now earn more working about 3-5 hours a day and I am happier than a pig in shit!
Honestly it's absolutely chucking it down with rain and I can't help but smile and think this is still waaayyyy better than office politics, clueless managers, commuting, crying all the time and stress.
I'm sure plenty people thought I was mad but I haven't had the Sunday scaries in 5 years, I actually prefer work days to weekends.
I have also tried a couple of side projects because I can sew so have done craft fairs. I think when I get closer to retirement age I will ramp this up.
I guess I am trying to say that you could do a complete 180 and do something you would find enjoyable, something you don't feel the need to retire from.
My friend completely retrained to be a surgeons assistant at 40, it was very hard for her financially but she got about 14k a year in bursarys etc and made it work for a few year.
You still have a lot of working life left so see if there's anything that excites you, any hobbies you can turn into a business, it might take a few years but once you get there there will be no more desperation to retire. Good luck!