I feel for you, I had similar issues. Once the lapband fails, that's it! Believe me, BTDT. I had my band removed and revised to gastric bypass. Big difference and I would do again in a heartbeat. My practice won't even do bands anymore as they have proven to fail more often than not long term. I feared bypass more than I can say, but for me it has been the true key....no more being a slave to hunger!
One thing I can say is that weight loss may be slower after having another weight loss surgery. Still, I am 63 years old and unless I'm losing, I'm gaining so this is good! Have no fear, just do it.