Hi. The information you have provided is not enough. Is there any stress or change in your life? One can never suffer from past or future because they do not exist. One only suffers from memories (of past) and imagination (about future)! Practicing mindfulness will help you. Sometimes when one is under stress, or worrying too much, he/she may have difficulty concentrating or focusing on something leading to what seems 'forgetfulness' (while it's actually lack of attention/focus that makes one not register things). All this can be addressed after understanding your problems in detail. You can consult any mental health professional for the same.

Need to evaluate