My lawyer released private information about my case to my mother who I don't talk to anymore

If the infomation was part of the legal case, then it is no longer private and becomes a public record.  If your medical records were submitted to the court as part of a complaint, or and affidavit, then those records are public.  Lawyers have various rules governing how they advertise.  A lawyer doesn't "specialize" in any field unless he or she is a Certified Civil Trial Attorney or Certified Criminal TRial Attorney or Certified Matrimonial Attorney.   A awyer may concentrate in an area or have experience in an area, but can practice any type of law.