Hi OP,
I am you, back in September. My decision came to resign came to a head and the moment I resigned, I was placed on Garden Leave. I have actually spent the last two months cleaning, getting fit, and I have started a coding course which was free.
I had a thread about this just two days ago on job hunting at 57. I have learned a few lessons in my job hunting and while I may not find something that is as well paid as my last role, I have gone through my finances and adjusted spending so that I can look at a lesser salary as I wouldn't want to be in the same position again in such a role.
I agree with the PP, (and I have had moments of panic & despair) use this time now as you work your notice period, to draw down some kindness for yourself. How long do you have to work? You are brave to put your own wellbeing above a job, and the main conclusion is that dont resign, get a new role while you're in job as always easier. But it isn't, is it ? Sometimes we have to walk away to keep ourselves well.
I have two weeks now until the end of my garden leave. I have had five interviews, and have gone for lesser paid roles and not been successful but I have used the interviews as practice, then today, I was offered a role that is slightly less than my previous role, but brings me a new dawn.
I did look at a couple of websites: restless (they have a job section for the over 50s) has a good section on work, CV tips etc. (Some of it I found a little patronising but overall, it helped me through )
I found the move valuable advice from this forum in all honesty. Plenty of threads here in this section.
What is your industry ? I was going down the route of temping had I not secured anything or even housekeeping in hotels as that would have been something that paid the mortgage at least and given me some light relief.
It is brutal but it is a learning time, and sometimes as my employer told me, sometimes, maturity is priceless and he welcomed it. I am working remotely and I had to go through three stages of interviewing.
Good luck, OP, let us know how you get on. You will come through and back in September I felt distraught but with time, I have come through and spent one month, full time, looking for a full time job. Give yourself the space to heal.