it really doesn't hurt to call since you are in so much distress. just tell him the memories brought up in session are really causing you pain and difficulty and you need help sorting them out and you don't think it can wait till next week because it is interfering with your functioning. that you aren't functioning. just expect to hear no based on your past conversation with him. that's the worst that could happen. but who knows, he may say yes or he could talk you down enough on the phone to get you through to next week. take care