What do the doctor and the gentlewwoman see Lady Macbeth doing? What do they decide to do about it?

They see her sleepwalking, and acting out her guilt. Lady Macbeth gets up, goes to the closet, reads a note, writes, and goes back to bed.  She also "washes" her hands- trying to remove the blood that has stained them.

The doctor tells the woman that he cannot help her, that she needs help from God. He realizes she has a guilty conscience. The doctor goes to tell Macbeth.