111 Mental health line - is it helpful?

Hi, I am really struggling right now and considered ringing 111 for urgent mental health help... but I just don't know if it is going to do any good or just cause more stress. Does anyone have experiences of ringing 111? Was it useful?  I am severely burnt out, exhausted and in desperate need of a break, but I have to still meet one deadline by next week (an interview and presentation which could possibly do some good in long term and which I spent a lot of energy on over past weeks..) and then there is work... I am physically also in a fragile state as well as mentally being completely out of it- just can't focus, have no energy or motivation at all and just so frustrated that I seem to almost hate things I normally love. I keep crying because I feel so desperate and can't see a way forward and I am so worried about the future and if I will ever cope with a PhD or a full time job... I just feel like such a failure and so lazy that I can't seem to get the energy together for this final push... but then the issue is that it never stops. And I just don't see myself coping with my job much longer either (i don't like it and it has been very intense).... Sorry. I am rambling on. So sorry for being such a mess.