Losing My Memory

I seem to be having trouble with my short term memory. Surely I am too young for it to be an age thing? My long term memory is fine, it's everyday things I'm having problems with and sometimes it feels like I'm going crazy. I'm always writing stuff down, working things out on good old tradtional paper, but sometimes I read something I've written and I don't have a clue what I was thinking of at the time. I'm hoping it's a temprorary hitch, perhaps related to this low patch I've been going through.