I want to sell our home and purchase a smaller one when my husband is in nursing home on Medicaid. Are there any ramifications?

My husband with Alzheimer's is in nursing home and on Medicaid.  House is paid for and in both of our names. Will half of the selling price go to his nursing home care? Would this mean I can only purchase a home that sells for whatever my half would amount to? Will this make him ineligible for Medicaid? Will he have to repay the past 18 months that Medicaid paid? I am POA and we do have everything in a revocable trust in my name. I need some info as to how to go about doing this & what effect it will have on our finances. I am in the state of Texas.