My story is similar in as much as I am 3 years post band and have had to have it emptied. I judge each day what I can and cant eat and stick to it. I can usually feel in the morning what its gonna be like. I try not to each to much and I also avoid rice, Pasta etc and maybe only have a spoonful if I am having something saucy like curry. I still eat soft or Soup for lunch so as not to irrate my band and avoid chicken and pork unless minced or very soft.
I know we all need to vomit from time to time because stuff gets stuck or whatever but (and forgive me for saying so) you sound like you maybe getting an eating disorder as you are aware what is causing the problems but still do them anyway. Or perhaps you just need to go back to basics with you nutrisionist and discuss your eating habits and get a bit more motivation. I found my issues improved greatly after sticking to a liquid diet for a couple of days, it gave my stomach time to settle down and any swelling from my vomiting eased. Maybe this could be worth a go too as you may be consatanly irratating you stomach which in turn is causing the restriction from the swelling, not the band.
I personally dont think that vomiting straight after eating would necessarily cause massive acid errosion as acid takes time to be produced. But I would think that long term vomiting would have its own risks and tooth decay could be one. I know I was concerned about this, plus I was worried my band had slipped which for me is enough motivation to try not to eat stuff likely to cause me issues.
Hope you get back on track soon.
Jo