The decision is yours. Understandably the uncertainty of change may be what you are finding difficult. I believe that some colleges do courses for preparation for Retirement. Maybe you could make some enquiries. Also the Human Resources / Personnel department of your workplace may have schemes, information, advice which may be of assistance to you.
You mention feeling "tired, tired, tired" :- Have you seen your GP, as there may be a Health reason for that.
You mention considering a move nearer to your Daughter and first Grandchild. A house move is a major change to consider, also it may not be a good idea to undertake too many major changes in a short time scale. It may be worth discussing these topics with your husband, GP etc.
Job title / Career had often defined people in the past ( grave stones have symbols on them signifying the person's employment ). Often when people first meet, an early question may be what do you work at? Yet we were people / individuals before we work, whilst and we are people are we have given up work.
You may find when you do retire some day that you find out, or rediscover who you are, what your interests are, what you share with your husband ( other family members, as well as friends). There are libraries, community centres etc which offer courses such as computing, photography etc. You may take up new hobbies, as you may feel that you have more time to call your own. Regular meet ups / dates with family, friends etc. Time to see your Grandchild develop, they grow up so quickly.
Whatever you decide to do :- Best Wishes! Enjoy Life!