I Started My Period It Lasted 7 Days Stopped For

I started my period it lasted 7 days stopped for 3 then came back with a brown like blown then full on very heavy bright red blood full of clots. it has been 8 days of that when I got in the shower as I was standing there I got nauseous and very dizzy and sat down and a huge clot came out. I immediately felt like I was going to pass out then started vomiting. what is consistent with these symptoms