I can sooooo relate with your weight stall issue. I've been going through the same thing myself. My WLS was in early July. I lost 25 lbs in the 3 months prior to surgery and only 5 lbs during the pre-op diet stage. 2 weeks after surgery I lost an additional 15 lbs. Then HALT! NADA! ZILCH! NOTHING! for 5 weeks... OH MY GOD! What happened... Why did I stop losing! I figured this was some kind of joke someone was playing on me or something. I also know that I'm consuming way fewer calories than the recommended daily allowance. So why was I not losing?
What I came to the conclusion was that there was more going on that needed to be addresses. So like the detective I am, I did some research. I found that the reason for the stall is what they call "starvation mode". It's when your body is in diet mode for a long period of time and your body has adjusted to the new levels of nutrition you are consuming. It's like your body is hanging on to every ounce because it thinks you need to keep it. I also found that because I am consuming so much protein, I also am not getting in the fruits and vegies as much as I like to. So here's what I did:
I started adding a vegie/fruit smoothie every day to my diet. These smoothies can be incorporated with nuts to give you extra protein as well. Because they are a smoothie, the whole vegies and fruits will go through your stomach very easy without upsetting because it is all liquid. It not only helped "move things along", but it gave me a lot more balance. I also increased my calories by 100-200 calories a day. (I know... not easy after your stomach has been shrunk to the size of your fist). But if you add an extra snack in... it helps. Instead of 3 meals/snacks... I increased to 4 meals/snacks... Less time in between meals, so my body does not recognize that I'm 'starving' for food.
Another thing I've done is started logging my food and liquid intake on a calorie/nutrition website that calculates your nutrition values. I use My Fitness Pal. The calculator logs calories, protein, fats and carbs. That way you can tell each day if you are getting the recommended nutrition you need to stay healthy and still loose. If you get too few calories for too many days in a row, the calcualtor will let you know you can be in danger of 'starvation mode' which will possibly inhibit your weight loss.
I've started losing again (3 lbs) so now I'm no longer trying to through my scale through the bathroom window.
Sooo, if I go through a stall again, (and I know it will happen), I know that all I have to do is change up my diet and kick start it with fluctuating my daily calorie intake and change one or tow of my diet choices by either eating a bit more, or more often or drinking more fluids, or eating more vegies or something that will change the routine.
Anyway... hope this helps.