The people who hang out here got here through a wide variety of paths. There are going to be a lot of them who can relate to the feelings you're describing. I know that I can.
When I first contacted a therapist about PTSD, which was about a year ago, he told me something to the effect that, if it's PTSD, it can effect many different areas of your life and in many ways you won't even be aware of. He said that it won't go away by itself, it will generally get worse. (Then he said he just happened to have an opening the day after tomorrow, maybe I should stop by.) I did, and it was one of my better ideas.
Whether what you're dealing with is PTSD or not, there are some things none of us can deal with on our own. It's tempting to think otherwise, but if it's not working, it's not working. And it sounds like it's not working real well right now. There's nothing wrong with getting a little professional advice and input. If you pursue therapy (it couldn't hurt!) I'd suggest trying to find someone who has experience dealing with people who work in your field. This sort of thing isn't uncommon in your line of work. Maybe your department has some resources available. (You should probably feel that out a little because some places are more "evolved" than others. You might want to go outside work, in some situations.) Meanwhile, it might be helpful to know that PTSD is really a "normal" reaction to an "abnormal" situation. Don't give up!
And, welcome!