*TMI* PERIOD!! is this normal?

Yesterday was the first day of my period and it was agonizing. My stomach swelled twice the size and my cramps were so bad i was hurling it up in the bathroom all day. I couldn't do any else because i kept passing out and throwing up. Advil did nothing. No medicine helped. It was so heavy i was soaking through pad every 2 hours. Dark red blood with clots and bright red blood.

Now today, day 2, this is all I've bled all day....how did i lose so much blood yesterday but none today? I literally feel fine. Slight cramps but absolutely nothing like yesterday. Yesterday pain was a 20 out of 10. Today it's a 4 out of 10. What the hell