I would suggest just trying to stop now and breathe. You had no way of knowing what was going on in the therapist's life. So your reaction to his lack of response was not insensitive to his actual situation, even if it did show a bit of a lack of perspective and patience on your part as to his lack of immediacy - no matter why he had not responded. Then the next reaction swung extremely in the other direction of over- remorse and flagellation over the part you could not have known about. If it was me, I would try to just stop the swinging - over remorse can be just as useless as the initial impatience. If possible, I would try to breathe, remind myself of the facts and that the therapist doing or not doing something outside the actual appointment rarely is due specifically to me, and talk to the therapist at the next appointment.