Obsessive Compulsive Disorder (OCD) Support Group
Obsessive-compulsive disorder (OCD) is a psychiatric disorder, more specifically, an anxiety disorder. OCD is manifested in a variety of forms, but is most commonly characterized by a subject's obsessive (repetitive, distressing, intrusive) thoughts and related compulsions (tasks or rituals) which attempt to neutralize the obsessions.
In terms of the hoarding, if you would be open to it this is something that has helped others I know - ask a trusted friend or family member (one who knows you well enough to be able to discern what's actually important to you) to come in and take several trash bags of "things," whether it's clothing, figurines, random items, etc. Make sure that you're not present when they're doing this (very important). The person should keep the bags for four to six months, and if you don't actively look for or need any of the things that they took, the bags are donated or the items sold. This would obviously be more difficult if you keep meticulous order of the things that you buy, but if it's more that things are purchased and then are just around then it could help decrease the unnecessary clutter. It's very hard to let go of things, but since the bags are kept around for a while it's a reversable process.
Regardless, I hope that you find relief soon!