Sleep training back firing?

Please god ladies any advice?

We did the Ferber method two weeks ago. Worked like a dream. Cried less and less each night. Fell asleep light an angel by night 4 and slept through the night. Beyond my wildest expectations.

He learned how to stand two days ago and now it like starting all over with a baby whose 5 times madder and 10 times more dangerous. He's trying to escape. He's louder. Waking during the night. Crying louder and for longer periods.

I can't go back to not sleeping after two weeks of living the dream. And I spent a month convincing hubby this was a good idea and now I look like an idiot.

Will this end? Is there a light at the end of the tunnel? Has anyone been successful with the Ferber method with this much setback?