Congratulations on your success.
I could have written nearly everything you wrote. I, too, was extremely large man, though I had RNY and my surgery was open, so that was different. The first 2 or 3 weeks were the worst what with the huge incision, staples, and a drain that made the slightest movement a joy to behold.
Like you, my pre-op stuff went without a hitch. Well, on the Lung function one where they put you in a booth and you do a bunch of deep breathing. Yeah, I couldn't fit into the booth. I was worried about the Psych test but apparently I fooled them completely.
I likewise didn't have an exercise plan aside from the plan to not worry about exercise until I got to a svelte 100 pounds overweight. Walking is what I focused on. Once I got to 100 pounds overweight I had an exercise plan that didn't include a gym.
I didn't really have any complications related to the RNY. I wanted the "complication" of dumping and lo! I dump on sugars and fats. Dumping has been a great educational tool for me. I have had issues with anemia but I had other issues that contribute to this, so the RNY just made it easier for me to get anemic.
The non-scale victories are indeed the best. Being able to weigh on a home scale was a hoot.
Congratulations again.
Good luck,
Tek