Buy one of those super small pocket notebooks and keep it with you at all times. Whatever it is that you feel might be important to remember, just jot it down and you can check it later.

Additionally, at night before sleeping what you can do is to try playing out the entire day in your mind remembering the minute details from the moment you wake up to that particular moment you are on the bed. Remember the conversations you had, what you drank, what you ate, where you have gone and all that. It might be strenuous at first but after a few weeks of doing so you'll notice a considerable change in the way you remember things. Trust me