What I have found out about the band slippage is the location of the band, front or back of the stomach, if they didn't suture up your stomach under the band, that can cause it to slip and excessive vomiting. I think mine may be caused by the excessive vomiting. I got really sick at Christmas from eating something my body can digest and ever since then I haven't been the same. It is just over the past few weeks that it has gotten really bad.
Your hunger may be due to your band not being filled yet. They usually put the band in un filled so your body can adjsut to it so during that time you have no restriction and you can eat like normal. Hopefully after your first fill you will notice a difference. I didn't lose that much weight the first couple of months, but once I got my band adjusted to my sweet spot the weight started coming off alot eaiser. Keep up the good work and good luck!