I feel like start running and not look back!

Hello,
I haven't been back here for a while. Today is been a bad day seeing my husband behavior. He was diagnosed with MCD on Jan 2023, he’s been taking the pills since then, I never expected the pills to do a significant change BTW, his memory has gotten worse but it's not that what is driving me mad.
He spends all his waking hours, which sometimes go until 1-2am, working outside in the yard (this is AZ, 3 digits heat now) on his "projects". The problem is those projects always result in leaving the yard worse than it was, look at the photos. These are from the latest one: a water feature he was going to built among the retaining wall rocks. The first one is from when I thought he was finished with it, is nothing like you'd expect a water feature to be but I thought thanks God he’s done with it. The second photo is from today when he’s undone all that and he keeps digging
around for what? I don't know. Then he’s breaking the cement on the border of the patio bricks, if I ask why he draws a blank.
Selling the house would be the only way to get money in the event he lives long enough for the disease to get to the last stage and I won't accept to be his only caregiver since we have no family to rely on. I feel so stressed thinking how his doing will decrease the value of the house.
What can I do?