Anyone else experiencing memory loss?

These past 6 months my performance at work has been dwindling and one primary reason I attribute is memory loss. I find it difficult to recall key points of mails, design reviews, MoMs etc. and often end up missing out things at assigned tasks. What's scarier is that it not only applies to new concepts, I often find myself forgetting even formerly familiar things. During morning updates and discussions I find myself giving uncertain inputs and asking shaky questions because I find it hard to remember key terms, figures etc. I sometimes even forget to pick up some assigned tasks altogether. Random brain freezes have become everyday affair. . Sleep-wise it has been little medium-poor but not so bad that could explain such drastic changes. I'm 30 yr old, male, unmarried and don't have any major health issues (except some stress / anxiety and accompanying Irritable Bowel Syndrome condition). . If anyone else experienced this, how have you dealt with it?