If you lost you Qatar ID card. first make a copy of your passport and bring it to the police station (morning Only) at Mugalina, after that They will give you a letter in arabic. second you have 2 options. first give this letter to your mandoop and prepare about 200-250QR about 4-5 days. or you bring it to the Immigration office with your passport and picture (that's what they told me in second option). Goodluck