For me it was trial and error also, at first there was many things i could still not tolerate, but today, almost 4 months out, able to eat way more things then at 4 weeks post op. Everyone will be different from what i can see, so you will need to try foods yourself and see how you can handle them, even if you can't eat them today, doesn't mean you will not be able too in a few months.
The dreadfull 3 week stall happens to most people!!
Don't worry, if you have read the treads on VSG, you will see that it happends to MOST people and do not worry, you are not doing anything wrong.
It happened to me, 3 weeks weigh in, a big ZERO for me on the scale, i too was quite upset, but ever since then, the numbers on the scale have gone down each and every week, some weeks are better then some, but your body needs time to adjust sometimes and the scales don't always reflect the numbers