Remembrance Problem

Dear Sir,
I'm 24 years old and having good build.I'm a Software Engineer by profession over here in INDIA.
The problem i'm facing is that while working in office the top part of my Brain (i think in medical terms its Cortex),gets heated up and and i feel like really exhausted,i cant recall the thing that i was trying upon,though i worked on it last month.
Its not like that this situation occurs after long hours at work but its there when i work at my normal.And if at this moment i try hard the cortex gets heated up and a nerve over there starts beating,which is easily observable at that time,by placing hand over there.
This remains the same for couple of hours with mild pain over there in the top part of head.My office hours are normally 7:00AM to 4:00PM,but it usually goes till 6:00 PM

Please help me,with the possile solution to get rid of this.