recommeded use for d-bol is 4 to 6 weeks to be safe, yet everybody is different (body genetics, tolerance, dosage amount, etc). Some people are on d-bol for up to 8 - 10 weeks but with weekly blood tests, liver tests, etc.
I'm on a test, d-bol, deca cycle right now and just ended my d-bol dosage 5 weeks at 45 mg / day. And will continue the 600mg test/week, 450mg deca/week for another 7 weeks. I started to feel some lower back pains three weeks in the cycle. It was the first time I've used d-bol, and from what I've read these kind of pains happen because of the extreme pumps d-bol causes. I felt these pumps in my lower back, and severly in my calves when I was running.
So, in my opinion, I think these pains are just the muscle pumps you are experiencing right now. My suggestion is not to exceed the use of d-bol for more than six weeks unless under doctor's supervision.
About the Winstrol (winny), it's really not smart to use Winstrol (winny) in the same cycle where you used d-bol since they're both liver toxic. Save it for later. And if you're using bulking Anabolic Androgenic Steroids (AAS) such as sus and d-bol it's better to concentrate on gaining the muscle instead of shredding it with something like winstrol.
Get big first...and save Winstrol (winny) for a cutting cycle. That's my say.