Most common causes of short
term memory and concentration
impairment are excessive stress, psychological reason, recent head injury, certain medications, hormonal imbalance and Alzheimer’s disease (if you are in old age). I would recommend you to see a neurologist who can evaluate the details of your case and could better determine the insight of your situation. In the meantime, try to do some meditation exercises (eg. breathing exercises), have a balanced diet and avoid stress.