I was not diagnosed with lymphedema, but when I was almost 300 lbs my legs, feet and ankles were so swollen. I used to lay on my back, feet going but the wall and read a book before bed. Within 20-30 minutes I would have to urinate. I would sleep with my feet on risers throughout the night. No kidding, I would "lose" about 5-8 lbs throughout the night. That is how much fluid I was retaining in my legs and rest of the body.
This repeated daily!
RNY Surgery: 12/31/2013;
Current weight (2/27/2015) 139lbs, ~14% body fat
With VSG there will probably not be much change in six months. Even with DS or RNY, the body normally has enough reserves for the first year. As long as you are taking your supplements, you will probably not become deficient for a very long time, if ever.
Real life begins where your comfort zone ends
There are no "tricks" it takes diligence and awareness and will for the rest of your life. I have used myfitnesspal.com to track my intake because it tracks more than just caloric intake, it also tracks other "nutrients" like sodium, fiber and the like. You should also be measuring and weighing your portions, thinking you can eyeball the portions got you to where you were before the WLS and will get you there again, despite the WLS, if not careful. I thought I could eyeball them until I actually measured out 3/4 cup of Raisin Bran and 1 cup of milk. It was then I realized that up until that time I was probably eating double portions of both. One more thing I would suggest, allow yourself the occasional junk food. If limited to once per week and controlled intake, a serving or two of ice cream per week won't kill your other plans.