I m not one to run and see a doctor every time I feel some sort of unwellness coming on, but I ve been forgetting a lot, including things that have happened just hours before. Mood swings are worsening. I ve had sudden numbness starting from my shoulder down to my knee, and it will last for just a few minutes. I am only 47 years old and dementia runs on my Grandfather s side of the family. I tell myself its only temporary because it usually goes away. Is this something I should really worry about?