Wow, this post really touched me in so many ways.
Sometimes when we are going through hardships in life, we get blinded by what we see in front of us for the moment and it can cause so much pain. There are many instances where i'm sure most of us wish we could go back in time and change things and i'm sure this is one of those times for you.
Basically I think you can get your wife back, but I can tell you it's probably going to take some work. Unfortunately, you are going to have to grovel a bit (sorry to say), but it's true. You may have to wine her, diner her, have as many dates with her as you can, maybe even plan a romantic trip somewhere if you can afford it and just pull out all the stops you can.
Go back to therapy with or without her...and get things cleared up. I personally like cognitive behavioral therapists. I don't want to add insult to injury but in some ways you did walk out on her at a tremendously vulnerable time. I cannot imagine having to go through IVF and doing all the work and my husband wanting me to stop and making the decision to move out to his mother...that would really break my heart in the worst way and the trust factor would definitely diminsh greatly. Support means a lot to women during this time.
If you really want your wife back you are going to have to sacrifice the distrust and little burts of anger for a period of time until you regain that trust...i'm not going to lie to you, it probably wont be easy initially. Also, are you involved in any sort of religion? Do you pray and go to service? I really believe that having God in my marriage is what has gotten us thus far. Sometimes I get so angry at him, but at the end of the day, even when i'm pissed, we sometimes pray together. My husband doesnt always do things right, but he's there with me on the all the Dr. visits and he for the most part makes me feel like he's behind me on the IVF.
My heart breaks for you and I really am praying

that you and your wife can pull your marriage back together. Do not give up on her, do the work and take a bit of the backlash...it's worth it for your future and the rest of your life.
Good luck! Let us know the progress on how things work.

__________________
Me - 38 (PCOS, Both tubes blocked)
DH - 37 (everything is fine)
1st IVF Dec - 2006
2nd IVF March - 2007
3rd IVF
Nov 20 - 1 healthy egg transferred on 5th day
1st beta - 33

(Nov 30)
2nd beta - 47 (Dec 3)
3rd beta - 28 (Dec 5) numbers declining. Was told pregnancy is not viable.

- 12/9
12/10 - spoke with Dr. and he said there's hope. starting another cycle. Dr. did internal sonogram, everything looks ok.
12/10 started Aygestin pills
12/12 starting Lupron
12/18 - still on Lupron also had hysterosonogram to check cervix...everything seems to be ok.
1/8/08 - started Follistim 300mcg

1/18 - retrieval - 11 follicles
1/21 - embryo transfer 4 follies
2/1
Taking a break until 9/15/08