If you need help now, please contact the Samaritans. While this is not a trans-only service, they offer 24/7 support to people with mental health difficulties. They also have a text service, though it may take a while for them to respond.
Freephone 116 123.
Text 07725 90990.

You can also contact 111 if you need urgent medical help or advice, or 999 in an emergency.

Be: North are a trans-specific charity based in Newcastle who offer one-to-one support, peer support and advocacy. They have a very useful page on mental health crisis help, which includes local crisis team numbers and practical tips to help with suicidal feeling, or supporting someone else through a crisis.

There are several charities in Durham that offer arts therapy for people with mental health difficulties. While these are not trans-specific, many people report that doing creative activities in a supportive environment has improved their mental health. Some of these local charities are: