I have been in this position. Please pick up Tony Beshara's book, "The Job Search Solution", or "Acing the Interview" by the same author. Don't schedule another interview until you read one of them. Job change is very difficult now and these books give you the right way to handle the blood-chilling questions concerning why you left your last job. He covers tons of situations and how to handle them and convince the interviewer you are the candidate they can't live without! Best of luck to you!