Whenever I try to study or do some mental work, a headache start and as soon as I stop thinking mentally, headache goes away. I am also experiencing memory loss. I usually forgot what was asked me to do or buy. I have also undergone MRI and ECG, they are normal. Somewhere I found attached screenshot to describe my condition. I am not able to understand the root cause of this condition and what is the name of this disease. Please suggest.