First, let me say kudos to you for admitting it! Ever since I got severe PTSD 2 years ago, suicide has been on my mind often, two times came close but held on for dear life . It is , sadly, a quite normal thought for people with PTSD .
As my experience as a counselor (had to leave my career when I got PTSD ), I often assessed for suicide. There are certain questions to ask but as long as the person didn't have a plan or say they were going to do it, we would just set up a written safety plan. It's one thing to feel like not being in the world for one for minute because it's too unbearable with the symptoms of PTSD , yet another to have a plan to lull yourself . This said , professionals should always take it serious . Being in the other side now, I've told plenty of professionals I would rather be in heaven but wasn't going to kill myself. The two times I really wanted to and searched for best ways, I told no one. I'm grateful I didn't do it, today! There must be a reason we have made it this far so keep holding on for one more day. If you really want to kill yourself , please call the suucide hotline (I have called and talked to them) and just talk or call anyone . I know the fear involved with that but it helps.
I've been to treatment twice over the last 10 months due to the severity of my symptoms ( I had no idea, so sorry for those that suffer with this). It really helped in March . Hope this helps and please reach out if you feel like hurting yourself .