I know the feeling. I really struggled with being a submissive, wondering if I really could submit. But I did find a wonderful experienced Dom who helped push me to be honest with him and myself. I did flashback at one point but he seemed to know what was going on before I did.
So yes, I agree, professional help and a patient Dom make all the difference in the world. One thing I have also found is once trust has been given it is usually forever. (Unless like Arria said they are truly an asshole). lol