I'm really sorry you're having such an issue with your band. I won't apologize for calling the band a tool, because that's what it is. It isn't going to work magic, or instantly fix anything. But you already know that.
My band is working just exactly like I'd expect any TOOL to work. But like any tool, it needs to be worked properly to do its job. If you're having these outrageous side effects, you need to talk to somebody about adjustments to get it in line. That's why it's called an adjustable gastric band - so it can be tuned up. It will only work as well as it's set up to work.
So even though I won't criticize, I do have to say, after four years of suffering as you have, I'd sure as hell be making a lot of noise to my doctor about it. Or I'd find myself another doctor. There is no reason to suffer with having a band, if it's properly adjusted.
Good luck!
Dave