Bleeding out of no where?

missed a period twice in a row for Aug and Sept. now in october i have one. it started out light now its getting heavier and heavier and lighter. its been on for NINE days and is still on. my regular periods usually last for 5 days. with this being said i have frequent urination. its so bad that each night i wake up at 2 then 4 in the morning. this is strange but before i go to a doctor i would like to have suggestions please. what could this be? is it normal after two missed periods to bleed continously this long with no pain?and somethings just keeps tapping in different spots of my tummy. could something be wrong with....ughhh plz just help! no gullible answers plz. thanxs!!!