As James said, you can contact the crisis team yourself if you call 111 and listen to the options, then select option 2 at the appropriate time. It will be the option for something like ‘over 18 adult mental health crisis services’ or something along those lines.
You can also reach out to this GP yourself if you are both registered with the same one. Make an appointment for yourself and then when you attend explain what you are going through. They may then follow up with him or sign-post you/him to other support services.
I’ve been where you are – well I still am dealing with it – and it is a lonely place and extremely draining. The system for those who attempt to take their lives is broken. There are charities who can support you as you need to take care of yourself as well.