I started my period yesterday and completely bled through my pants with a tampon in. Last night when I was changing another tampon a huge blood clot came out. This morning, more blood clots came out and saturated a super plus tampon within 30 minutes. I am at work now and I am not bleeding as heavily, but I have a horrible headache and feel very light headed. I have eaten something this morning and have been drinking water as well. Also, I am a 29 year old female.