I've thought about this a bit recently as it came up for me too. When I first went to therapy it was right after being diagnosed with MDD etc and being put on meds. At that time one of my biggest issues, aside from the depression, was suicidal ideation. As I explained it to my psychiatrist, I had no real intention of killing myself, but every day I would have these (intrusive like) thoughts such as driving to work that I should pull into the other lane into a head on collision, or walking by the parking garage, that I should go jump from the top, or in the office, that I should hang myself above my desk. Then I would come home and imagine scenarios, all while sitting in front of TV or something benign, such as I overdose on pills and my husband finds me dead, he is relived, finds a better wife and they live on in our house. Anyways, it was not constant, but it was daily I was having these thoughts, and then when pushed to my limits, if my husband was around and asked what was wrong I would sometimes say "I wish I was dead" or "I hope I don't make it to work today" or something along those lines. He would get mad, called me crazy once, so I would try not to say those things even if that's what I was thinking. I wondered to myself if I was being manipulative, I mean the thoughts were real and happened whether I said anything or not, but I decided not to talk about them at home thinking maybe talking about them was like a cry for help gone too far.

My psychiatrist was/has always been interested in this and always did ask me about it, even long after I was on meds and the thoughts stopped, so he was my main confidant in this area. Every session, he'd ask. I've always been careful in how I talk about it, the first thing I say every time is "I have no real plan to kill myself, but I keep having these morbid thoughts of ways I could die..." mostly to ensure I don't get locked up, but also because it's true, I've never really planned to kill myself. When I started seeing my therapist I told him about the thoughts, I think, but like you I don't anymore. My therapist mentioned once he had a client that killed himself, and ever since then I've not wanted to mention it in the worry it might upset him or remind him of that. It ended up being a non-issue for a while because the thoughts went away, but then recently when I came off my meds there was a time they came back and I had no one to talk to about it. In the end I just decided to go back on meds.

I did read recently that it is a common symptom of C-PTSD, at least according to one guy. I think that you should be able to talk about it, but it is just risky business because it upsets other people to hear that you feel so low. Lucky for me my therapist can sense when I'm depressed even if I'm not saying it, but there is a part of me now that feels like a failure when my mind is really chaotic like that, and I don't want to admit it to him, because that would make his therapy seem like a failure. Bottom line though, if you are having those kind of thoughts often it is at a minimum a sign your depression is back and/or worse and that you should make some changes.