Courtney,
Based on your post, I expect that your family and my family are in significantly different socio-economic classes. Unfortunately for you there is also a lock-step similarity between our families. I am Mr Courtney a number of years farther on in life.
The basement is full. (for purposes of this discussion- The Garage is full - down to goat paths (Thank you for that wonderful term Dianne) and an average stack height of 7'. Some "Collyer Brothers" danger to the goat. There is a 13' long 6' high pile in the living room. I was a great churner but I no longer even have room to do that. I have refused and continue to refuse to go to therapy. Mrs Dave has had major struggles with this situation. The first response of every mental health professional she has consulted is that she should leave the relationship. My things are more valuable than people. My guess is that there is a 98% or better chance that what you have now is the best environment you are ever going to experience in this relationship.
Last fall, mrs dave told me she was moving out if I did not get a space in the garage for her car by .... . I decided she had invested enough in my life that I owed her an effort to change. The car is not in the garage yet but there is significant progress and she is still with me. I started with a base of 3 books for consultants. I have currently been stuck, depressed and unable to proceed. I have added a fourth book and am making some additional small steps. The mental and emotional effort to make changes in the mindsets resulting in the living style I described above is very large and I can understand people starting and giving up.
Here is an example of what you may need to be patient with if change does happen.
Imagine the small can in the grocery store of mushroom stems and pieces. Thursday I picked up one of those cans from a box in the garage. It contained some change (diane $1.13), rubber bands, good nails,bent nails and some washers. I probably spent 5 minutes on that can. I wiped the change off so it would go through the coin sorter and set it aside. I studied the washers and finally decided to save one because it was a fender washer and I sometimes have uses for fender washers and could think of a place to put it. The others went back in the can for scrap metal. I contemplated the rubber bands, thinking about whether they were still stretchy enough to use and where I could store them. I finally put them in a yougurt container along with a tree twig for trash. I had also poured all the dirt from the metal can into the yougurt container so the scrap washers and nails would be in a clean can. I then started carefully examining small diameter finish nails to segregate the unbent new ones from the bent used ones. My "Norm to date behavior" would have been to finish that process and put the new nails in a little cabinet. I was able to make a change this time and think "I have new nails this size in a box. I don't need to do this work." and I put all the nails back in the can for scrap metal. I hope that is a precursor of at least a small change in the way I can evaluate things. The point of all that is to try to show you very clearly an example of the minute level of detail and value we (hoarders) place on things and giving them up; regardless of the frustration experienced by someone such as yourself watching or waiting on that process.
Mrs Dave and I have been addressing the pile in the living room today. There will be some noticeable change in that by tomorrow evening.
Mrs Dave says I am an outlier for having been able to make the amount of change I have so far made without any outside help so pay heed to all of Tillie's comments, including the ones about counseling. I have had counselors, just books instead of face to face. Brooks Palmer, David Reynolds, John Bright-Fey and Robin Zasio. ("Big Names" for a one-time fee! 🙂 .
You have a life situation here that is going to present you with a significant challenge and maybe not the results you would wish to have.