Having bad stomach pains nausea bleeding and im feeling kinda dizy what's going on im in a lot of pain to please help im on Depo-Provera and having unprotected sex?

Call your Dr. If you are having unprotected sex, you may be pregnant even if you are using depoprovera shots. It's important to make sure that you are not pregnant and that your symptoms (bleeding, pain and nausea) are not due to internal bleeding from an ectopic pregnancy. You should do a urine pregnancy test and call your dr.
Go to ER. You may well have a bleeding ulcer and the blood loss may be the cause for your dizziness. Go to the nearest er now before something really bad happens.