Mike, I know there are lots of mental health mentoring charities out there. What they would do would train you to help someone else who has a situation a bit like yours. That might seem odd but if you have to contextualise the negative thoughts someone else might be having it will help you with your own thoughts. It’s also been scientifically demonstrated that helping other people has mental health benefits for the person providing the help.
It’s interesting that your current reflections on your well-being were triggered by a friend talking about their tragic suicide experiences. If suicidal thoughts are something you have experienced yourself I can well understand how that would be a distraction from nuts and bolts of living and I would recommend you talking to a human being about that.
If not maybe getting some sort of training to deal with other people in that situation would be of benefit.
We have training of that kind here in Scotland (most work places have a fire warden and a first aider and now they are trying to spread mental health first aid around which I think is a great idea). I know there are similar schemes in Australia and Canada because the scheme I attended shared materials with those projects. It might be worth while looking into similar programmes in your locality using the internet.
I always recommend rationalise feelings. Feelings are a reaction to something and if you can’t pin down a reason for why you feel a particular set of feelings and deal with that in a practical way it may well be that you have some sort of medical situation which could be fixable and a trip to the doctor might be all that’s needed. Good luck.