Here is a list of useful links of other organisations who work in similar areas to hoarding:
Association of Professional Declutters and Designers
APDO members offer practical, sympathetic help to organise homes and workplaces. They represent the organising industry and shares expertise with media, PR and events. They also offer training, mentoring, networking, promotion and support for professional organisers.
Rehab Recovery offers a free helpline and intervention service for people suffering from eating disorders.