I used to email my T between sessions if I was really struggling. He used to offer to call me, or see me for an extra session which was helpful at the time.

The last time I did it, earlier this year, his response was awkward. He didn't offer to call and hasn't offered to see me for an extra session in years. Maybe I needed him too much and he got sick of it I don't know.

But if you never have emailed them in a crisis before I would say go for it, see what they say. They might be able to offer support between sessions. I hope you are ok.