I feel your pain!
The house is stuffed to the gils. Every closet, every drawer, every room is stuffed with stuff. My late wife was a pack rat of Biblical proportions.
I have a life time supply of office supplies.
Two linen closests full of towels and sheets. We are talking 6 feet wide, 9 feet tall and 2 feet deep closets here.
Many bookshelves of books I will never reread.
Boxes of work items; some things dating back 30 years ago...far out of date but until I decide if I am going to do some consulting or not they continue to exist "just in case" I need them.
Old computer software manuals (Win 3.1 etc.)
Old game software on 5.25 floppy disks.
Boxes of old computer parts, drives, keyboards, cards, etc.
Several old computers that I have not used in 10 years.
Boxes of old Consumer Reports.
National Geographics back to 1975 up to the current edition.
Collector plates-50+ of them.
6 full sets of dishes
4 cabinets full of assorted glasses
Boxes of silver plates, etc.
5 tool boxes of tools; mine, my grandfather's, my father's, and my late wife's father's.
etc. etc. etc.
It is mind boggling. The problem I have is the intrinsic value I see in these items and the desire to recoup as much of it as I can. The collector plates cost about $30 each....you can buy them on Ebay for $3.
Maybe now that I am retired, I will eventually have the energy to start my own Ebay business and sell off what I can; then toss the rest.
We have cleaned out two rooms of furniture by giving it away to family and friends but we still have several items yet to give away. Selling furniture has not worked very well for us so giving it away is far less hassle and makes up feel better.
A really big garage sale awaits us in a couple of years as we hit the final stretch in downsizing.
Hang in there...it is never easy to part with stuff you are emotionally attached to.