Im 23 and my memory is declining. It is getting worse and I don't know why. It isn't just effecting my short term memory, its my long term as well. Example... yesterday I was singing rock a bye baby to my 13 month old. I went to repeat the same song I just sang and I couldn't remember the words. I tried so hard to remember but I just couldn't.

Start a journal and record these memory lapses for a week or so. Then make a doctor's appointment and take your journal with you.

Sudden and dramatic memory loss needs attention.
Blood might not be getting to your brain.
(I'm 67, and memory loss is hitting me slowly, and it's to be expected, so I don't plan to have tests to find out if plaque is clogging my carotid and jugular, etc - probably true!)