I have been taking 10 mg of Provera twice a day, every day, for a few months now. My cycles were alternating between 25 and 45 days, and lasting from 8 to 16 days each time, and this has not changed.
The main reason I am trying Provera in this way is to attempt to suppress the sciatic pain I am having from a large pedunculated fibroid on the back wall of the uterus that is sitting on my sacral nerves, as when I was only taking 10 mg of Provera once a day for 10 days out of every cycle, I had noticed a significant reduction in my pain.
But now despite the daily, higher dose, my pain is breaking through ... and I am discussing a hysterectomy. I am 49.
My side effects (which came on within days but which have improved over time) have been significant breast bloating and water retention, worse insomnia (although I have not slept through the night in 4 years anyway because of pain), and mild hot flashes. No problem, except for the continued pain!
I had also tried the bioidentical version of progesterone, Prometrium, which was wonderful for helping me sleep but did absolutely nothing for my pain.
If it weren't for my pain and I were a candidate, I would have tried an ablation -- but I have so many other internal fibroids that have distorted the uterus, they did not think it would work. I did have a D&C 12 years ago and it gave me about 7 or 8 years of improved bleeding, then the flooding periods started again.
The only time my period would not stop at 27+ days was when I had developed a large, 6 cm ovarian cyst. While I was getting a second opinion, it ruptured on its own, so at least I was spared that surgery!
Maybe you need a different dose of Provera? My symptoms were no worse on 20 mg per day every day, as opposed to 10 mg per day on only 10 days each cycle.
I hope something in there is helpful to you! You are not alone, and we all understand your frustration.