GrandmaViv I'm so sorry to hear that you are feeling depressed after retiring - and that the rather rude behaviour of a bus driver has really upset you. I can understand that.
I'm not quite sure how to make you feel better, except to say that at least you can look back on having had an emotionally, intellectually (and presumably financially) fufilling job. I look back on the many years I spent in a fairly mundane (though reasonably well paid) job that I found both unsatisfying and stressful - a horrible combination. Yes, it perhaps makes me appreciate retirement more, but it also makes me regret all the miserable years I spent at work.
I am sure once you have had more time to adjust, you will find there are many things you can do that will fill your days and make them meaningful and enjoyable.
If you are reasonably comfortable financially, you also have the opportunity to take more holidays and short breaks and have some meals out.
I appreciate having the time now to be a member of two choirs, join various courses, help with my grandchildren, etc. etc. I was always too late home or too exhausted to be able to do these things when I was working.
Good luck and I hope you soon feel better.