Why won't my period stop

I have been bleeding non-stop since 2012 and some days are worse then others. I don't cramp I don't feel anything down there at all I go to the dr and I feel ignored and they throw my weight in my face yes I'm overweight but that still dosent explain the nonstop menstrual cycle. I mean come on I havnt had a days rest from washing something out. Does anyone have any advice on what I should do???