I don't see much in the way of self-pity on this site. Posters go through difficult patches and seek the support of others - which is always forthcoming. But that is not the same as self-pity.
I find lots of very brave people on here and take my hat off to them.
It is not self-pity to have pangs of regret for things done/not done and for the loss of health and strength. It is simply being a normal human being.
The pangs come - they go - and we pick ourselves up and get on with life.
Should we downsize to help our adult children out?
.
xx 
. As for throwing things away, I've hurt my wrist by painting a fence [some sort of repetitive strain I think] and I must have thrown away a wrist support that I've had for years. Mind you, it might be repetitive strain from spending so much time on the bloomin' pooter
! And can I bring myself to throw out the huge cardboard box wendy house that resides in my living room [and also contains more junk]. Methinks I am beyond help...