Have you ever had your drink drugged?

Mer
The other night, I completely lost all memory and I was really sick, but I had only had a couple of drinks. And I never felt drunk. I was fine and then I lose all my memory. 
I was with my boyfriend so he took care of me, but I'm wondering if anyone has ever had their drink spiked and what it felt like. It's really scary being totally unable to remember.