FAQ I'm sorry your GP was crap.
It is obvious that loads of mners going through horrific times recieve invaluable support and help here.
fwiw I don't think there should be an 'either or' situation with regards to mn vs samaritans or health service.
I still think though that if someone starts an OP with specific suicidal ideations that the latter is the much better option than the former, and somehow that is what the OP should be being told...in conjunction with what other advice other posters have to offer.