Have you any contingency plans for tonight if you end up feeling that bad again? Nights are always the worst for me too. You can go to A&E and they will arrange for the crisis team to assess you. You could try NHS 111, they should be able to put you in touch with a crisis line that is open. I suppose you could just lie about where you are, give a false postcode or something.
I know that having been knocked back once the very last thing I would want to do is set myself up again. However, knowing that you can reach out can be an empowering experience too, I hope it is for you. My twisted sense of humour would have me ringing up at 00:59 and then force them to talk for 6 hours. Well I would do if I wasn't so apathetic.
Take care, stay safe and hugs