Recovery time/space

Hello, long story short; until this last year or so, I was having quite a lot of recovery time / time alone; I need this in order to keep going, to cope with my job. Both daughters had moved out, my wife used to work a lot of nights and 12 hour shifts; I had plenty of equality time with her, and lots of time alone. I sometimes used to think that I shouldn't be enjoying that time alone so much, but it is very good for me.

Now though, work is getting much harder, with lots of performance management and micro management (I can't wing it or mask so easily anymore); also, have been through the whole process of requesting reasonable adjustment - they won't accommodate a reduced workload, but they are providing lots of extra supervision and I can work in a quiet room and have protected time and since my meeting with HR and union rep, I am now not fearful of being sacked if I get overloaded and need sick time. The problem is, work is harder and going to get more so, my wife changed her hours for health reasons (and I supported this) and both daughters are moving / have moved back home. I rarely get an evening or whole day to myself. I feel crowded and feel like my brain is being squeezed, I feel like I have lost the 'recovery time' which is so good for me. I do not socialise or do groups etc, and I do not want to; I really enjoy my own company.  I like to go off to quiet places when I can.

How do you tell loved ones/family that you really need more space/time without them taking it personally, or feeling rejected? The way I try to (not very successfully) explain it is that this is not an indulgence, but a necessity in order that I can keep on functioning and be healthy and happy. Any advice?

Thank you