I had this problem too and it was really not good. I couldn't remember anything short term. After a lot of bloodwork it was determined that my hormone system was out of whack because of long periods of high stress and no sleep, which can have some semi-permanent effects on your endocrine system. Cortisol, adrenaline, all that stuff. One thing was that I was really low on testosterone along with some other stuff and as soon as I started getting test shots and some other things, I felt like a different person and my memory straightened out. Years later, I am somewhat back to normal and don't need the shots etc. but I have to work at remembering things. At this point it's not a big deal, so don't assume it is going to be a permanent thing.