What Causes Memory Loss?

Good afternoon sir,

My name is ashraf from ashraf from dubai. Let me to come to my exact problem pls. Now iam suffering from loss of my memory. This is happend after an operaion. 4 months before one blood vessel in my head right side is broken and bleeding to the brain happend . But no cloting .Through a emergency operation iam recoerd now iam feeling loss of my memories