I'm so sorry you are feeling this way.
I have been where you are, and also couldn't face the thought of a phone call.
I sent them an email. They did reply (I think within 48 hours).
All their emails are "sent from Jo", or were at the time. They explained that it was just a name they used.
They didn't make any kind of judgement, and they gave a lot of support where it made sense, if you see what I mean. I mean, they pointed out and reaffirmed a lot of good in my life that I had mentioned, but they didn't overdo it, or give lots of praise, and nor were they very emotional.
They offered the opportunity to keep in touch and said they would help find me resources to help, should I want them.
They also asked how others in my life felt about my situation, how much they knew, and if I thought I could talk to them.
I found it very helpful to email them just in writing it all down. That in itself was good for me.
I think that they will do their best to help to the extent that you let them, or want them to, but they won't force anything and they won't pretend to be able to do things they can't.
It's a good start, just to talk/write to them, or anyone. They are, I found, truly objective and realistic.
I hope you feel better soon, and I think it's VERY important that you talk to someone.