You should be really proud of you W for actually brining up a psychiatrist...she's recognizing that something's wrong, but she doesn't know exactly what. Or perhaps she does know, but she'd be more comfortable talking to a psychiatrist (it's a safer feeling) than you. Plus a 3rd party would be able to be more objective for her than you could be.
As for the motivation thing...I can tell you from my own past experience that when you're "blah" as she seems to be motivation is a problem in every aspect of your life...it's not personal towards you, she just doesn't have the ooomph to do anything. I know what that feels like and it's no fun! The Paxil could be a contributing factor to this...but if she has issues she needs to deal with...then she needs to talk to someone too.
Sounds like she's wanting to work on things...she admits she likes sex with you, that's a lot further than many people are on this board...so take heart in that.
It really sounds to me like there's a great deal of hope for the two of you
