Can you email WA? Do they have a forum or something?
I think it a positive that you feel like you're on the outside, looking in. It's like you're not in the eye of the storm and are gaining some perspective, this is a GOOD thing.
I think EVERYONE who's ever been on the receiving end of any type of overbearing, bullying, domineering, or abusive behaviour has those thoughts, the self doubt, the 'it's not bad enough' etc.
And who is to decide what's 'bad enough', who judges that?
You are not a fraud. Your feelings are real. Nobody else's situation is YOUR situation, their situations are irrelevant, never mind who's worse or better off. You aren't overplaying at all, actually I think you've underplayed quite a lot. You deserve help. You did NOT cause anything. It isn't fine. You are very much worth helping.
Him finding out and being angry is a scary thought but it mustn't stop you from calling WA.
You sound exhausted. I'm sorry you're tired and sad today. You are doing brilliantly, though.