<human>: I'm hoping I'm just overreacting.  
A little while ago, I stood up and took a few steps to put something away, then looked up on my shelf. That's when my vision turned all black and I felt lightheaded, that same feeling you get when you've stood up too fast. I figured it was just that looking up after standing up made me have that feeling and that was normal, so I didn't think anything of it. Less than a second later, I completely lost consciousness. I have no idea what happened at that time, but evidently I fell to the ground, and due to the scratches on my hand I must have tried to hold myself up from falling before I did hit the ground. As I started coming to, I was completely unaware of what was going on or even where I was, but I felt my arm and leg moving uncontrollably and it felt like there was a muscle spasm in my leg, and I could hear and feel the objects around my legs/arms being hit repeatedly. My brain still wasn't putting thoughts together about why this was happening or what was happening, it just felt as if I was uncontrollably falling or tumbling around on top of things. When I finally completely came back to consciousness, all the muscle movements stopped and then my eyes opened, and everything felt normal again. I think this all happened within seconds, but I'm not sure. I was able to get up like normal with nothing more than some scratches, and I feel normal now. I've eaten normally today and got plenty of liquids as well, so that's not the problem. I am on a medication, but I've been on the same medication for the past 2 years and have never had a problem with it. I've never had a seizure before so I wouldn't know what it feels like.

Can you provide a brief overview of the text?
<bot>: Looked upwards, blacked out, lost consciousness, and when I started coming back into consciousness felt my arms and legs flailing wildly before I finally actually regained awareness. What just happened?