@Timetotakethedecsdown
You’re probably right. I have been advised to leave him in the past. It’s just not that easy. I have no idea where I would go or what I would do. Starting again at my age seems terrifying. Could I even do it with my health issues?
Yes, you can. To put it bluntly, if he left you, you'd have to do it - at least this way, it would be your choice. And having control over this would be a start to, ironically enough, doing 'what you have to do'.
Making an appointment with a solicitor specialising in divorce would give you at least an idea of options/potential outcomes. Don't tell him you're doing it, and even if you decide that you don't want to leave right now or in the near future, you have knowledge.
So that's at least 2, if not 3 appointments to make - one with your GP, possibly one with your therapist, one with a solicitor.
Doing 'something' (I hasten to add, not harmful to yourself) can also lessen feelings of ideation without intent, as sometimes, it can be that you're feeling trapped and powerless, rather than actively wanting to die - is it possible that your feelings are more 'I don't want to live like this anymore' rather than 'I don't want to live', for example?