I tend to flood and freeze up if I'm feeling overwhelmed. When this happens, it's usually because I feel like the world is crashing down and all is lost. One trick I've learned is to force myself to make a list of what's actually wrong. Usually, soon into making the list, I find I can group most of the issues into two or three larger all-encompassing problems. So it's really not all that bad. Having a finite list of problems is much better than having an illogical feeling that everything is wrong.