Lots of interesting theories there! I love a bit of hypothesising!
Must admit that for a short while in episode 4 I really wondered if eejit's shower moment would come true. The minute Georgie mentioned wondering if Elvis was really dead, I wondered if we were laying the way for a shower moment return - back at the Lane's house at the start of Series 2, the day before the wedding and none of it happened - hilarious but obviously not serious.
As for Dr Antonio, well that's an interesting one - I mean he has no particular reason to want to betray Georgie unless he is in on the plan to let Omar off the hook and wants to shut her up. Even then, it would surely only be on the grounds that he's a doctor and is responsible for Omar's medical care? He can't be part of some bigger conspiracy.
I think Georgie may perceive his involvement as betrayal - after all she's in no place to make any sensible judgments about anything. I think she'll try to do something to expose what she thinks is going on, maybe succeed in getting Omar brought to court, to face legal justice, and then have a breakdown when it all hits her. Now this might be unpopular, but perhaps some time later - months after getting help and counselling, she'll see the truth about the situation and realise that Dr Antonio was acting in her best interests. What I'd like to see is a hint of a better future - not anything overly romantic - but perhaps a post credits moment (like Molly and CJ) showing her seeking him out because there is friendship there and maybe, just maybe one day in the future there could be more - no bells, whistles or love hearts, just straightforward friendship....and Georgie's happyish ending as she leaves the army.