Hi Connie,
I'm sorry that you're going through this mess with diagnosis. Have your sx improved at all? How come your neuro. keeps changing this mind about your diagnosis? If your sx are improving, though, that's fantastic!
The yawning thing might be part of emotional lability. Check out this link;
http://blog.patientslikeme.com/2007/...ing-in-alsmnd/
I've heard from others that ironically (with your situation, I mean, because your doc. keeps claiming that you're simply 'depressed'), an antidepressant can work very well for this. check out some of the comments at the bottom from the other patients.
It might also be caused by a reduction of oxygen. Sometimes when I feel like my breathing is bad, I find that I yawn a lot, especially when I was working and the quality of my sleep was really poor.
Nicky