I ped out in the shower, and dont know why, help?

I was in the shower and the next thing I know, Im on the floor with bottles shattered about. I was feeling tired and slightly lethargic a little while before and then I was simply washing my hair and ped out. No idea how long I was out, most likely not to long, I think the water helped me out there >.> I was shaky and slightly dizzy when I got up off the floor to sit on the ledge for a few minutes. Does anyone have any ideas as to why I ped out? I dont have health issues, Im not on any medications, the water wasnt hot, it was actually barely pable for warm. Im not on my period or near it. I do have a tendency to get dizzy during showers and I ped out once before a few years ago but I have always figured that the water was simply to hot. Please and thank you for your knowledge as to why I ped out!