What kind of trouble could a person get in to if they lie under oath to the judge about an entire story?

I was kind of pressured into doing something by my attorney and I felt compelled to lie to the judge because the defendants to the case were not present (they're deceased) but now if the heirs come back, which I KNOW they will, Im worried they will say what I did was fraudulent, which it was, I was just under duress...what sort of problems LEAST to MAX am I looking at??? and this involves a home....taking the title....I just have a feeling that sh*t is going to hit the fan....also I currently use ANOTHER attorney, but I have not told him about these problems....I plan not to mention it unless 'someone comes back around'....