I have a teen who is under the care of camhs, their advice to all parents is if they believe a person is likely to follow through on suicidal thoughts they should be taken to A&E
A few years ago a relative was about to attempt suicide, I took them straight to a gp
Please do one or the other, either walk in at your practice and explain your situation, they WILL put you in to a doctor or attend A&E who will get you seen by a duty psychiatrist
People here will hold your hand, please do something, talk to someone, let them help you