I do sympathise and this is a strong lesson for many, never buy a business without doing strict due diligence and never part with any money until the visa is granted (your attorney should not have let you do this). Most businesses aimed at E2 visa are not good businesses, if there were good there would be sold to citizens, without the hassle of selling to someone applying for a visa.
We lived there for 5 year and had to come back for different reasons, we would still be there if we had a choice. It is a fantastic place to make money and whilst I would not stay there forever, we did have a wonderful time and I would have loved another 5-10 years.
For anyone thin king of making the move, I would strongly advose keeping some property back in the UK. This makes the burden of moving back (which most folks do) much easier.