Hi infoonptsd, I think "normal" is a whole range of emotions, not just numb, happy, and sad. An infinite range, really.
I've had periods of "normal" where I feel neutral I suppose, neither happy nor sad but still feeling good, and can respond with a variety of other emotions as the day goes on. And I've had periods like I'm having currently where it's definitely numb/empty rather than neutral. Like, feeling nothing at all -- kind of a withdrawn state. But crying for no reason out of nowhere, so I get you on that.
Feeling numb might be a way you could be protecting yourself since you have PTSD? Kind of a shield.