Been there done it got the stained t-shirt!
What shocks people is I have OCD - but sometimes I become SO anxious and ill I become avoidant.
Even just now I'm managing to 'do stuff' only once or twice a week.
It is embarrassing but it doesn't have to become permanent.
Do you have a cpn? If you do, and I think you should, you should be covered a team within the Cmht that includes a social worker.
Now people panic at this point but there's no need. Mental Health social workers specialise in this type of thing.
They may also (unfortunately postcode lottery) have within their job access to specialist cleaners who come in, do a deep clean up give you a starting point and then over time they come in regularly, but gradually do less each time.
Or they may know of volunteer support services that can help.
Lack of motivation with chores, hoarding etc are VERY common. There is help out there, sometimes it can be hard to access.
But if you speak to your cpn, or even your GP you could come closer to accessing such help.
But please don't feel ashamed of being ill. You can't help it. If you were physically restricted you wouldn't feel this way and probably would think to access support. It's no different with mh.