Hi Agnes:
Have you thought about measuring your success, or lack of, by a measure other than the scale? I no longer own a scale. There are just too many variables. There is #1 Muscle....much heavier than fat.
#2 Water retention due to hormonal reasons or excess sodium
#3 Your bones, organs and muscles.

I measure my progress by either the tape measure or a fat calibrator which measures fat you have on your body. Fat percentage is more important than weight in measuring fitness. I am a "big girl" ie. large bones and alot of muscle mass....if I measured my progress by the scale I'd given up a long time ago.