Selling our home, and the buyer backed down due to house inspection due to previously unknown issues. Gutted, advise needed.

The wife and I are moving out of our neighborhood and have an offer in, and mortgage applied for our dream home. We put our current home on the market, about two months ago, but due to the large number of houses on sale in our neighborhood, we only have had four showings. The house is about 115 years old and is priced about 8k more than the assessed value (back in 2006, and we've gutted and rebuilt the kitchen and bath since).

The last showing resulted in an offer which was acceptable to us, and we jumped on it. We were SO extremely psyched that we would not have to carry two mortgages.

However, the house inspection was yesterday, and the buyer will cancel the contract because the inspector found 'foundation problems', which we had absolutely no clue about. Something about rotting support posts (there is rust at the bottom of one of the support posts), and that foundation blocks have shifted. Again, no clue. Our realtor has known this inspector for 15 years and said she does NOT recommend this guy at all. But that is all irrelevant. We weren't given a chance to counter as well.

We've been living in this house for the last six years, and have spared no expense updating it, etc. We are OK to carry the mortgage on this house for a while, but are wondering what we can do. If this is an issue which will come up again and again in subsequent home inspections, we will never be able to sell the house.

What can we do? Would it be worth getting our own inspection? Can we get a copy of their inspection? Since there aren't enough people even viewing the house, it is just so difficult to lose a prospective buyer. The wife is inconsolable, the process is just proving to be a real source of stress. Any help would be appreciated. We are in NY if that matters. Thanks!

EDIT: (12/05/2012) Thank you everyone for your advice! We got a structural engineer and a waterproofing and basement contractor to individually inspect the basement, and both stated the same => NO issues with the foundation. It is structurally absolutely sound with no shifting. The inspector who gave this house a failing grade is known to be a fear monger in these parts, failing houses to get repeat business. How this guy is still licensed, much less in business, I will never know. We are looking at recourses now. It is too late to salvage this buyer, but the hopes are high for another eventual buyer. Thanks for your advice!