Why does Higgins go to his mother's house? What does he claim to be concerned about?

In Act V, Mrs. Higgins is in her drawing room when her parlor-maid enters and informs her that Pickering and Higgins are downstairs calling the police. Mrs. Higgins sends the parlor-maid upstairs to inform Eliza that the men are here and that she should not come until she is called. Higgins enters and explains that he is frantic that Eliza has left-he cannot find anything and now has nobody to remind him of his appointments. Mrs. Higgins scolds her son for calling the police as if Eliza were a lost parcel.