What will happen if I tell my counsellor that I'm considering suicide?

I have had CFS for about a year and a half now and in 'the last 6 months I've become depressed, not diagnosed though. the last three months I've been having hallucinations. I see my friends dead, dying or in pain. they are mostly visual. I've become scared of te dark, I jump at shadows, I'm always scared that there will be another hallucination. I was cutting for about 2 months but have atopped now. in the last few weeks I've started thinking about killing myself a lot. I don't want to but I do at th same time. I've been going to a counselor and I want t know hat would happen if I told her about wanting to kill myself? she knows all the rest just not that.. I know I meed help but I'm scared of what will happen...