INSANELY HEAVY PERIOD

Today I got my period after 5 months of nothing. I found out I bled through my super Tampon, so I got new pants and put in a super super Tampon and a huge nighttime pad. I bled through the super super Tampon and night pad in 2 hours! I have never been this heavy before! What is wrong? I feel fine, just bloated and tender boobs, like regular!