you could inquire in the Urology Dept of Hamad Hospital, just go to the OPD section and inquire about the procedure of getting an appointment with a urologist.

or do this as this is the process that i know in getting an appointment in the Hamad Hospital OPD: go to your nearest health center near where you live presently, talk to a doctor there and tell him you need a referral for a urologist, just tell him your problem and after getting a referral form go to Hamad Hospital OPD and book for an appointment with the Urology Dept.