Hey there!
I think your questions are perfectly acceptable and wise to ask. I've had my band since 2007, and although I have lost a good deal of weight, over time some of the issues you are wondering about have been a problem for me. For instance, sometimes it IS hard to eat Proteins and vegetables and sometimes it isn't. The body (this is my experience) changes all the time-so sometimes if you try to eat the same, exact thing you ate a few weeks ago just fine - you'll puke it up. And a whole lot of us have trouble eating in the morning, so be prepared to drink Protein shakes, etc. That goes for your periods too (possibly, and yes, for me it's an issue). So, when these tight episodes happen, we have one of two choices: 1-take your lumps and go to liquids until you feel better, or 2-drink milkshakes until you feel better. It's VERY HARD not to drink the milkshakes, it's true.
I don't know how many minutes food stays in my pouch, and the very specific and scientific data eludes me in general. I don't regret the surgery, and I was a self-pay too, but it is not an easy adventure. If you are worried about the amount of willpower it takes with this system you may need to look into the laproscopic gastric bypass, maybe? My mother got that, and she is doing great. But, over time you can work yourself back into being overweight if you are determined to do so. So nothing is an ultimate cure, but good habits do develop during the process that you can depend upon when needed.
I wish there was some fairy dust...
Best of luck in whatever you choose, and love yourself always, regardless. Be fabulous at any weight.
Melanie