Great advice from OneEyedJoe.
I went to extensive counseling, but I did not find a "cult expert." To make a long story short, I had unresolved issues concerning a suicide attempt that I thought didn't need addressing because "Jehovah" rescued me and gave me purpose in life and YADDA YADDA. So I got depressed when, more than 20 years later, that all turned out to be not true. My counselor aided me through my issues and we simultaneously (but mostly after dealing with the 1st issues) dealt with the JW's.
My point is, if a person leaves the JW's, they may have issues- their lifelong beliefs were a lie, they lost family and friends, they feel they wasted their life, etc. A good counselor will help you face your issues. If you are asking about counseling, you probably have issues. If you are distressed by your issues, get to a counselor. If you are not sure about the whole thing, read what OneEyedJoe suggested first.