Hi Sarah.
I had the bypass on 6th May and lost around 17lbs in the first 10 days or so. Then nothing. Absolutely no loss for just over three weeks, in fact I even gained three pounds during that time. Apparently this is quite normal. It also seems to be common for people to lose quickly for a week or two, then stop for a couple of weeks, throughout their time after the bypass.
My loss started again and I've been losing around a pound a day for the past week. I think I've finally got it in my head that it's probably best to get weighed monthly rather than weekly (or even daily as I was). I was thinking that my weight loss is slow, but when put into the context of me having lost 24lbs in 6 weeks, I find that amazing and I am well on my personal target of a stone a month for the first couple of months - then I suspect my loss will slow down, so I'm aiming for half a stone a month for the following couple of months.
The other thing I would say, is to measure yourself. Whilst I wasn't losing weight, I was losing inches. I lost one to two inches from each arm, leg etc, but an amazing 14 inches from my hips over a week.
It will come, it is 'normal' - just keep telling yourself that and as difficult as it is, record your weight monthly. You will get there. Good luck x x