Killer question that comes up allot, but basically SA is triggered and AvPD is personality.

Those who have AvPD usually don't know they have it because its who they have ever been for as far back as they can remember, are there has been no change in personality apart from knowing that there is something wrong with them but don't know what.

SA is I guess is noticing a large anxiety change in self when triggered
I know what i have said is fairly basic but its a mind field of similarities because those with AvPD can have the symptoms of someone with SA but a person with SA wont have the symptoms of AvPD.

Wish i never answered this question now, nothing personal The Grey Wolf, just every one will have a opinion which opens me up for criticism.

Oh and i haven't been institutionalized for having AvPD.

Welcome