Answer

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As far as the bleeding is concerned, if it is heavy in which you are changing one pad in an hour or less, this is considered excessive bleeding and can lead to anemia so this needs to be checked by a doctor immediately. This could be due to many things including stress, weight gain/loss, thyroid, hormonal imbalance, infection, illness, medications, polyp, cyst, amongst other reasons. The only way to know for sure exactly what is going on is to see your doctor for an exam and testing. If a thyroid or hormonal imbalance is suspected, a simple blood test will show this.
As far as the odor is concerned, if it is a fishy odor, this is usually due to bacterial vaginosis. This is a result from an overgrowth of normal bacteria in the vagina. Treatment usually involves either watching to see if it clears up on its own, or the use of antibiotics. It's not usually necessary for your sex partner to be treated. You can read more about BV here
http://www.cdc.gov/std/BV/STDFact-Bacterial-Vaginosis.htm
In the mean time refrain from douching. Douching can not only disrupt the normal pH of your body, but can also make it more open to infection. Also avoid any type of sprays or powders. You will need to see your doctor for an exam and testing for confirmation.
To help prevent BV eat at least 8 oz (226.8 g) of yogurt with live L. acidophilus cultures as part of your long-term daily diet. Consider using birth control pills, which reduce the hormonal changes in the vagina that may lead to BV. Limit the number of your sex partners. Multiple sex partners increase your risk of developing BV by changing the normal environment of the vagina. Only leave a tampon or diaphragm in for a limited length of time. You will need to see a doctor for confirmation, and antibiotics.