Welcome here to the Forum. It is a good move to come as you can talk with lots of people (you may have to browse and visit their threads as well as remain here in your own). That way you can receive support and have no time limit
I agree that at times support lines are not much help, it depends a lot on circumstances.
Yes, it is exceptionally hard for you at the moment, and if you are like I was, you may be blinded to all the things in life except your current circumstances - no job - separation - loneliness and seeing everything as pointless.
Coping with all this on your own is horrible. People help. You did say you had no one, even though you are estranged from your family do you think that applies to all, or might there be one to talk with who would care? A person elsewhere, perhaps from your old job? The hardest part of course is reestablishing the old contact, however it can be worth it
Talking of people is there any activity you can do that let you mix with others? Anything from the Gym to volunteering?
You has said you were thinking of changing jobs, would you like to say what held your interest?
While we are at it may I ask what in the past you have enjoyed, or has given you a lift? Exercise, reading, pets, podcasts .... You would know, these are just guesses. Mine: books & old TV Shows & movies.
I remarried around you age, whch was pretty amazing as this was after I'd been invalided out of my job, with not prospects, plus PTSD, bouts of depression and anxiety, not to mention being suicidal.
It all worked out, we are still together 20+ years later. I'm a different person nowadays.
One of the things have found to be very useful when becoming overwhelmed, hopeless and frightened of what I might do is a safety plan. No thinking, just grab it. I use this free one for the phone
It's called BeyondNow and is not totally what you might expect. It has the normal quick dial settings for an emergency, but also has a great deal of space to list those things I was talking about earlier, the ones you have enjoyed or given you a lift.
It can be hard to fill those things in by oneself. I found I was bad at remembering good things, but persevered and now have a lot, YouTube clips - to places to go - or imagine. The secret is to be specific, not "listen to music" but "listen to Paolo Conte's Via Con Me" or wahtever you fancy
I hpe to talk with you again