I've lost 36lbs unintentionally since june 2012, i've just experienced irregular vaginal bleeding this month. i've had normal blood work.fatigued?

Weight loss: 36lb of unintentional weight loss is significant. It may have nothing to do with your irregular bleeding. The workup can be extensive. Doctor's usually do tests like cbc, thyroid testing, chemistry panel. They'll see if there's a gastrointestinal problem or if there's a concern for malignancy. They'll also assess for depression which can cause weight loss. Best of luck to you.