Whenever the feelings start becoming too much, it's obviously time to back off and regroup. Remember the basics: the feelings are lodged in the subconscious and need to be brought out for your ultimate well-being. If you go too fast, however, it can be overwhelming. Just take it easy, find your pace so you are clearing feelings but not inviting too much to come up. You can use the basic meditation guidelines just to get calm and centered without pushing too hard. The first program in the guided training is ideal for this.
Negative feelings are reflected in our experience of the world. When the feelings are cleared, we no longer perceive them being reflected back to us, and so circumstances no longer bother us, or we no longer have the need for those circumstances, and things change spontaneously.