Scary amnesia experience. What happened to me [10 Pts]?

I'm fairly active. I've also been very broke as a of late, and as a result, I've been eating poorly. Basically just what I can afford to get. I have lost a significant ammout of weight doing lots of cardio, eating a simple diet iof meat. Vegetables, rice, other such things. Definitely not starving.

One day, I started to feel very spacy. Could not carry or even follow a conversation. It got so bad that I got sent home from work. The next day, same thing. Blew a job interview, ended up again getting sent home from my current job.

The worst part, and the point of this post, is what happened in the middle of the second day. My memories felt like they were traveling through my head on a film strip. That's what I literally saw. Then the strip broke. I lost almost all memory.

I couldn't remember who I was. What day it was, what moth. Hell, not even what year. I just knew the day was going to end at some point, and had no idea what I was going to do when night fell.

After trying and trying, small traces came back. I remembered enough to find my way to my job, only to be sent home.

When I got home, I took vitamins. Fell asleep and had a vivid dream. Woke up, took more. Same thing a couple hours later. My memory came back, extra-sharp. I've been back to normal since.

My question to you, is what in the freakin hell happened? How did I loose my mind, only to get it back with vitamins?

Ten points for best, most well-informed/researched answer.