Early Onset of Amnesia....

I am getting worried about my brain development, or should I say brain "deprovement" recently. I seem to be suffering from Amnesia. Since my return from Moscow, I find myself being very forgetful. I used to think highly of my incredible memory but not anymore. I thought to myself that it could be due to stress but now that the major projects are over, the condition has not improved. Should I seek medical help? Should I take more Omega 3 tablets? This is definitely not a case of being pregnant! What could be the cause?