Not my period....?

So I already had my period this month but it was oddly short maybe only 3 days I didn't think much of it because I recently went off my BC and am now on a new medication for bipolar, then I got violently ill throwing up and chest pains I couldn't even hold down water or toast then yesterday directly after being sick while doing LITERALLY NOTHING this tsunami came out of me. There's a lot of brown thats not dried blood because I took pictures right after it happened and a lot of clotting and I'm stumped to what it is, a second period?implantation bleeding? Wtf is going on?