Can you maybe find yourself a little part time job, something you enjoy so it's a half way house between work/retirement and the knowledge you have that additional bit of income will keep the mental concerns at bay...After a year or two you may well find moneywise you don't need the extra and can choose to continue if it's enjoyable or not...
The first couple of years I/we stopped working and lived off income from properties and a couple of other bits and pieces I was religious about tracking everything, with experience it proved we had a pleasant sufficiency so over time I grew more relaxed.
Best of luck.