It gets better Mo it really does.
Focusing on what you dont have makes things worse - or does for me anyway. I know that chronic (no pun intended) conditions like arthritis are likely to keep bringing your attention back to what will resolve that pain but all you can do is notice that noticing, remind yourself why you aren't doing what you might more usually do and then refocus. By which I mean deliberately put your attention somewhere else... over and over and over and over and over again... and if you rinse and repeat often enough THEN like I said it gets better.

Source: lifetime Phd student of addictions - 'studied' hard everyday for 30+ years 😉