Input needed??

okay so, ladies, i need help. These last few months maybe since january, my period has been VERY light, light almost like a 3 day long spotting. then all of the sudden i have a tsunami, bleeding through a super in less than an hour and when i do change my tampon a huge clot the size of my middle finger with the thickness of my thumb literally comes out of me. it was a very sticky clot as it stuck to my tampon and it hurt coming out.. i haven't had sex since january as well, someone put their input in. 19