Heavy period

I woke up this morning in a puddle of blood from my period and some clots. I have NEVER experienced something like this besides one other time in my life. I'm only 24 and i do have pcos which also screws with my hormones but i usually have normal flow periods, nothing this extreme. I'm not cramping, just very, very heavy to the point i need 2 pads and extra pants if i go anywhere. Is this normal?? I'm kinda scared because i have lost a lot of blood to the point my legs where so shaky & weak.