Sorry to hear you are in such a bad place OP.
I spend several hours a week volunteering for a similar crisis line. It's not an easy role by any stretch, sometimes it can be incredibly harrowing, but I have always been proud to give up my time to help others.
Crisis line volunteers are there to listen and help people figure out a way forward for themselves- whether that be making a GP appointment for the first time re mental health, contacting their existing mental health team for more support, contacting someone close by fit 'in person' support, or busying themselves with some sort of distraction (like, yes, a walk) in order to keep themselves safe in the short term. A lot of the people I talk to have no idea where to start when it comes to addressing their specific issues, so direction to a particular charity or organisation can be hugely helpful sometimes (miscarriage or domestic abuse support for example). Obviously it hasn't helped a few PPs but based on feedback we get at the organisation I volunteer for, these services can be hugely valuable for a lot of people.
Sad to hear such scathing remarks about Samaritans on here, feels like a bit of a slap in the face, but I realise it's not personal and services like this won't help everyone. Volunteers don't have magic wands sadly, and most care a great deal- they wouldn't invest themselves in such a role otherwise.
Hope things are feeling brighter soon OP, and that you get the support you need.