How about people are more aware of it and reporting it more? That seems at least as likely as your misdiagnosis/expansion theory. And, by the way, just because there's expansion of a category doesn't mean it's wrong to do so. It may be that experts recognize a linkage they might not have seen before, figured out that people who were previously seen as "close" to diagnostic boundaries are actually seen to suffer as much as those seen to be well within the initial boundary, a cure becomes available for something, etc.
You seem to come from the point of view that expansions of care indicate nefarious intent on someone's part. You fail to see that the world, and thus, the boundaries we draw upon our realities, change. Your paranoia in the face of it is unbecoming.