Here are a few options for you:
1) Lower the price if you can, and see if that makes a difference. Make sure you keep it high enough to cover your mortgage and the Realtor's commission, unless you have the funds to make up the difference.
2) Contact your bank and ask whether they will consider a short sale. If so, you may be able to sell the house for less than you owe. There is a lot of paperwork involved in the process, and it is hard to get banks to agree to it, but it's worth a shot.
3) Rent the house for now and put it back on the market in a few years after the market recovers. Hire a property management company or Realtor to handle the rental. They will take a commission and send you the rest. You may not be able to get enough to completely cover your mortgage payment, but at least it will cover part of it.
4) Try to join your husband as soon as possible. Being in separate states is not good for your relationship. I hope you can be together again soon.