I first want to tell you how sorry I am that you find yourself here, but on the other hand given your situation this is a great place to be with much support.
As for you question about stopping the visions...... unfortunately only time will cure the visions.... they will get fewer and fewer I can promise you that.
As for your wife's OM#1 and OM#2 not being blocked on her facebook anymore, I personally would call her out on that and ask her why...... I want to mention a book she should probably read "Not "just friends"".
It seems like she is letting her boundaries down again, why? I don't know that is something you would need to ask her... but I definitely suggest bringing it to her attention..... because if you both have agreed to work on things and are in counseling then there is no reason why she should still be allowing either of these men any contact with her.
I hope the conversation goes well, and I hope things start improving for you soon!
"A tree falls the way it leans.....be careful which way you lean"