TTG,
Actually you are running a little late.

This response often hits at 6 months. For years we have conjectured as to why. The best guess seems to be that at about 6 months (not a hard number for sure) the BS knows the marriage can make it. At that point all of the anger, resentment, pain that they have been holding in to do plan A, starts to surface. Hence the feelings you have.
You do realize that Harley recommends plan A for a very specific period of time and surely not for a normal marriage behavior right? Why? To do a good plan A, the BS must put their "taker" on the back burner. The "taker" won't stay there long because of the embalance. In a good marriage the "taker and giver" are balanced in a manner that is natural to you.
I would guess it has taken you longer to feel your marriage has a chance because of the LTA. I would say you are normal. Your feelings are normal.
My suggestion is set a deadline for reevaluation at say 6 months from now. At that point evaluate your marriage, check to see if progress is being made (even baby steps), and check to see what you really need that you are not getting.
My inclination is to express to your W, your anxiety, your fears, and what is really worrying you. I am not sure if she can handle it. If you two have been going to counseling, consult your counselor and solicit her/his recommendations about talking to your W about this.
It would seem you are in fact in the normal pattern.
God Bless,
JL
EDITED TO ADD THIS PS: You will never regret giving your marriage your best shot, no matter what. As you point out if your children grow and ask you what happened you can look them straight in the eye, tell them and tell them you did your best. If your marriage were to end, and you found yourself in a new relationship, a reasonable question by the new woman in your life would be "what happened", you can look her in the eye and tell her you did your very best. It is all you can do. Don't second guess yourself. You made the right choice to give your marriage a chance.