Loss of consciousness. The right path.

A year before i had fallen down from stair facing top of head portion in surface, then went to doctor and he suggested CT scan, after Seeing CT Scan doctor told that there in injuries then i explained what i felt i.e. loss of awareness and consciousness, memory problems. He suggested for blood test and reports shows deficiency of vitamin B12 and in lipid profile triglyceride and total lipids increased. He has given some medicines and injection and i have completed that course of medicine but still i am feeling the same problem. In the starting it was worst feeling but now i am habitual of that. From few days i could not even focus on my work properly and feeling frustrated. What should I do please suggest me the right path.