Frustratingly long periods after depro provera

Patient: I am 18 and i was suppose I started to take the birth control injection in march 2011. I was suppose to go for another shot in september but I decided to stop. october, I got a period lasting 3 weeks, december I got one or 2 weeks, now, i have been having a period for 2 and a half weeks and it’s heavier than ever. I feel dizzy even if I stand and i feel depressed and frustrated. I am anemic so I have been taking iron pills but i feel the same way. I have also been drinking about 12 glasses of water per day and have been taking omega 3 tablet. is there any way to stop this? is it normal? is something wrong with me?