undoing a quit claim deed

My brother did his Will at his attorneys office, naming me as benificiary of his farm. Then he quit claimed it to me later so that I could feel safe putting a mobile home on the property now, instead of waiting till his passing. I took out a huge loan, readied the property, bought a mobile home, and now he is saying he wants the property back. He is now saying he only quit claimed it to me so that I could put a home here ( he lives in the exsisting farm house here on the property) and that now I have to give it back. I told him no. He says he will stay here and make life miserable for me and that I cannot throw him out (not that I would have). Also the property has always been rented out to a local farmer for $7000. a year. My brother states that he is intitled to that rent money and that I have no legal right to it, so the farmer writes the checks to my bro, even though I now own the property. That part is okay, I don't really care about the money, it's just the principal and the fact that he is now threatning me. Should I retain an attorney? He is lying, and stating I coerced him into giving the farm to me. I am so scared. The bank pretty much owns the property now, because of my loan. I will loose everything and go bankrupt I fear.