How do we as parents obtain guardianship for my 18 year old son who has been deemed incapacitated?

my 18 year old son is in college and home on break; he began to display bizarre behavior so we took him to sentara emergency room. the local social worker and the PWCS LCSW evaluated him and deemed him incapacitated and convened a community services board. the csb issued a temporary detainment order (tdo) and transported him to poplar springs treatment facility. the order was for 72 hours. a hearing was held today, my son had a court appointed attorney, both the doctor and the LCSW recommended that my son be committed for up to 30 days for evaluation and treatment. We were informed that unless we obtain guardians ad litem, my son comes to his senses and signs a release form, or establishes a POA/Advanced Directive; we will not be able to receive any information regarding his care or made any decision.