DDC crashing with some optimism for you!! Something similar happened during my second pregnancy...prodomal labor for many many days, although I never had dilation checked, so I can't tell you if I dilated and regressed or not.
BUT...the light at the end of the tunnel is this...on a Friday night contractions started again at dinner. I ignored them thinking it was yet another false alarm. Around 10pm I was too uncomfortable to sleep, so I got in the bathtub. I thought the contractions stopped completely in the tub, and it wasn't deep enough to cover my tummy, so at midnight I got out of the tub. Suddenly ctx were every 2 minutes and INTENSE!!! I woke hubby up and at 2 something in the morning, only a little over two hours later, I had a baby boy!!! So labor was 6-8 hours long total, but I didn't know it was "real" until the last 2 hours. Made the days and days of start and stop contractions worth it to have a short labor! (my first labor was 44 hours!!!)
Hang in there mama!! Maybe baby wasn't quite in the right position and your body recognized that...trust your body, it knows what it's doing.