Suggest Treatment For Prolonged Period With Clotting

iam 45 years old. i started my last period on 1/20/11 it has not stopped since. it is mostly clotting. yesterday evening it was very heavy, about a tampon an hour. i started taking bupropion sr 150mg in 12/10 to aide me in stop smoking could this be the reason for this? my period in december was normal