The executor is probably correct. His obligation is to protect and administer the assets of the estate first.
If it takes vacating the house to prepare it for sale, then that's what it takes and the eviction is proper.
You've basically got three choices:
1 - Spend lots of money on a lawyer and probably end up evicted anyway. Or
2 - Quit spending your money on the house and find another place to live. Once the house is sold and the estate is closed you'll get your share of whatever money is distributable.
3 - Find youself a home loan and buy the house from the estate.
And, yes, if the eviction is proper, the court can order you to pay for it.