notquitethereyet said, 'why don’t you think of things you would like to do on your own or with friends at the weekends?'
And Casdon said, 'I think you must work on your fears of loneliness when he isn’t with you though because you must have your own life that isn’t dependent on his support 24/7...'
Whilst I do agree that non of us should be totally dependent on our partners, and we should have our own friends to do things with, isn't it often the case that, particularly at weekends, most friends are spending family time together, or doing things with their own partners. When one half of a couple is left alone, it's not always so easy to find someone to do things with, without feeling you're encroaching on someone else's precious weekend time together. I realise that some people are single, and aren't in relationships, so they do need to find hobbies, and like minded people to spend time with. But when you are in a relationship one tends to expect to do things together, particularly at weekends. Or, at least, that's my experience amongst my friendship circle.
I don't think the OP sounds like she has a 'fear of loneliness', she's spent 30 years with her DH working shifts, so she's obviously used to it. To me, it sounds like she's rather disappointed that her DH has taken on a weekend shift job, when they should be enjoying retirement together. The traditional weekend of Sat/Sun is obviously important to the OP, and the prospect of going through the rest of retirement, or for as long as her DH decides to stay in this job, without being able to spend the weekends together, must be quite upsetting/annoying.
OP wrote, 'We always said if he did go back to work it would have to be something that didn't involve working nights and weekends'. Her DH went against what they had discussed and decided together, before he applied for a job, so I think he is in the wrong for considering to take on the job in question, and she needs to speak up now, before it festers away and becomes a bigger issue between them.