Hi Sooner
If you are pretty sure your W won't go with you, and you are worried about costs ect why not just tell her you are going to see one and see what she does. If she says no tell her you are going to see one on your own. You don't have to really go just tell her you went. Go to a bar and talk to the barman. They say it is as good as therapy right? The thought of you seeing a therapist might make her wake up a little. Tell her the therapist is really gorgeous and very understanding!!
The only problem is if she does decide to go with you after all. If this happens tell her your T left town suddenly and you have to arrange a different one.
OK OK lying to your wife is bad. But it'd be funny.