I'm a PhD student, and my advisor published what appears to be the theoretical frame I came up with for my dissertation as a standalone paper with some other people (not me). It seems (to me, though who knows) like I was going to make a reasonably important contribution to my subfield, so I'm even more cut up than maybe I would have been. And now I have to finish my dissertation as other people are now using this theoretical frame on data similar to mine. There is also, of course, a small chance that my advisor came up with the same idea as me, but it smells wrong, since we don't work in quite the same area. (My feeling that something is wrong is bolstered by knowing that he very definitely screwed me over in another incident.) How do I handle this? Do I have to cite his paper? I cannot switch advisors --my department is small, so there isn't someone else who can advise me in it. I'm also too close to done. I have no desire to fight; I only want to survive, preferably with some of my dignity intact (i.e., some way not to cite my advisor's paper). I'd be grateful for comments from folks who are well along in their careers in academia, since I think part of my problem here is really not understanding academic culture.
Context: I did a masters in another subfield before starting my phd; my idea is basically drawing a common set of ideas from the master's subfield into the new subfield (where they are almost never used); I cited all of these things in my dissertation proposal, which I turned in before my advisor's paper came out, and which my committee read. The tricky thing is that I could still see my advisor saying the idea came from him - which is false and unlikely, since again, they don't know my other subfield. But still, I am terrified as well as angry.