Dragon Age Inquisition running but switching between fullscreen/windowed mode

I just bought the game, which I now regret, wish I'd bought a copy if I was going to have performance issues like this.  Mine won't run full screen but if I select "full screen windowed" then I get full screen.  If I try to return to "full screen" then I get it running in a small window, whatever resolution I choose it's the same half-sized window.  Every time I use origin there is an issue.  Usually there are issues with the in-game origin functions.