Didn't Dr say anything!!!! Depo can make things more sensitive. Less lubricated. It's hormones so it can make you depressed, whiney, cry, mad, spleep, happy, headaches, cause acne- everywhere. But after the speed bumps getting on the road you're good for 3 months. Some people bleed with their normal period times at first. Lessening with time to no period. But I'd definitely go back if still bleeding after the 3 days. Take the ibuprofen like Dr said. Read about the drug. It has good and bad things. Educate yourself so you will know whether you need to be scared.
I had a bad reaction to depo when I was 16. I bled for a month and a half straight. It's just the way it reacts in some people's bodies. I was also sore and very moody. The bleeding was the worst part...period for a month and a half! But all tests had come back normal. It was just the way my body reacted to it. You should definitely try a different birth control and skip the depo when the 3 mnths is over.