Hi Sandylee!
I've been on this diet for one year three months now and have lost about 40lbs...but very very slowly and at times no loss for months. Nevertheless I'm sticking to it as it is the first time in my life I've ever been able to loose weight and not feel hungry.
You can bet your bottom dollar that if you go back to just a 'healthy' diet you'll put on the weight you've lost already.
Try all the things recommended for stalls. The following have helped me in the past:
Drink green tea - at least 4 times a day - it speeds up your metabolism.
Drink plenty of water and give up sweetened soft drinks.
Keep up the excercise (the weight you have gained is almost certainly muscle...and muscle burnd fat.)
Remember that being in ketosis just means you are burning fat...including dietary fat.
Being at the same weight for 6 weeks is nothing compared to a lifetime. I really think you should stick with it and see what happens.
Whatever I wish you well,
Robert