Hi, I tried the exact same method, provera for 5 days to induce period, and mine was unsuccessful. I had amenorrhea for almost 2 years, and recently it came back but it came back naturally, not as a result of the Provera. I can't speak for everyone bc everyone reacts differently, but I was really depressed after I took the Provera for only 5 days. I don't know how much was due to the despair of not having the results I wanted and how much was actually due to the drug itself though. I did gain weight, or maybe water weight, which didn't do well for my depression, and my skin broke out. Maybe I'm just really sensitive to it.
It's strange, my doctor wasn't very informative about provera either...he merely PROMISED me that I wouldn't gain weight and that my period would definitely come within a week of finishing the provera. He was wrong on both counts, and after that I couldn't even get him to answer my emails or phone calls to request for my medical test records. Best of wishes to you, hope it works out better for you than it did for me =)