Through a CORI a 39 year old Disorderly and Possesion of valuim and percoset was discovered, what to do

While applying to provide foster care for my grandkids a 39 year old charge of Disorderly conduct and possession of percocet and valium was discovered. I was 18 and an emotional wreck due to multiple deaths in family. I had spent 18 months in a Drug Rehab, then the charges were suppose to be dropped and sealed. I spent the night in jail 2-3 years later, went to court and again told by my Lawyer the case was dropped. Now the court has told me to put a day aside to turn myself in, spend the day at the courthouse to go in front of the judge. Do I need a Lawyer and what should I expect? I have never had an arrest since.