Me too feeling so sorry for your sad deprived childhood, and of course this is going to be with you to a greater or lesser extent through yout life. I would echo what others are saying about seeing a good therapist. It isn't magic and it won't make the pain disappear, but it has a good chance of making it more manageable.
Just thought too I would clarify the position for you about your mother and your children, as you have been given some misleading information on the thread.
The position is that your mother could apply for a Contact Order in respect of your children (S.8 of the Children Act 1989) but she has to get leave (or permission) of the Court before she would be entitled to do so. There would then be an investigation by CAFCASS (Children and Family Court Advisory Service) they are social workers but don't work for social services departments. The assessor would then write a report for the family court, giving a recommendation and the matter would be decided by a judge in the family court. This is private, not public law. Given what happened to you I cannot believe that any social worker would recommend that your mother has contact with the children. However there is the presumption in law that children have the right to contact with their extended family (as some parents just refuse grandparents contact) after a separation or divorce, when the child has a loving relationship with the grandparents and clearly this is unfair.
I would not worry at all if I were you - she probably would not even get leave of the court in the first place. Also the government are stopping legal aid in private law cases, and I am assuming she could not afford to pay a lawyer (very high costs) and would therefore have to represent herself in the family courts. I think it highly unlikely she will do this.
Someone has suggested you try to legally prevent her from seeing the children. There is such a thing as a Prohibitive Steps Order (again S. of the CA89) but this is to request that someone stops doing something if you see what I mean.
I suspect your mother is all sound and fury signifying nothing. Please don't worry but I just thought it was important that you knew the facts.