Congratulations and hope you enjoy this new phase of your life. I retired just six months ago and I'm just starting to feel like maybe I didn't wait too long. After 24 years in the military, and 24 years in the civilian work force, I decided at 70 that time was more important to me than another paycheck.
When I first retired I found myself thinking that at my age I might not get to do the things I dreamed about, but as the months have passed I am feeling better about things. I need about another 6 months before I can really relax.
My advice to you is to develop some other routine to replace your work routine; one without stress and of your own choosing. I feared for awhile that I would end up like a scene out of the Sopranos, where you see Tony still in his bathrobe in the middle of the day, unshaven, trudging down the driveway to get the newspaper. I now go the Sports Club almost every morning, after relaxing with coffee and the internet until about 10 AM. Afternoons are for going to the range, running errands, or helping my wife with helping out with the grandkids. Once the weather gets better, afternoons will mean long rides on my motorcycle again.
One of the best parts of retirement has been looking out the window on a day with horrible weather and knowing that I can just stay home if I feel like doing that; no stress, no pressure of getting to the office or worse, traveling to the various places my old job required me to do regardless of the weather. And knowing that all of the email I get is stuff I am interested in, or sales offers, but NONE have the power to strike fear into my heart like a crisis at work or a reminder that I missed a deadline.
Enjoy life. Live long and prosper.