I have had memories return recently, I feel they merely returned cause I was ready to handle those few memories. I didn't do any actual therapy with a T. However, I came to a point several years ago on this one issue....one specific abuse...where I had dealt with my feelings on what happened to me no matter who the abuser was.
I agree with amandalouise the memories come when you are ready. I don't know if therapy helps..but you need to be ready so you aren't floored when hit with the cosmic bat.
Personally, I prayed for years that God would reveal things to me when I was able to handle it.

Hope I helped a bit...

~AngelsRUs~