Suffering from chronic pain and/or depression can erode at your self worth leaving you with a considerable loss of self-esteem, among many other things. With falling energy levels and a lack of drive to engage in activities, both at home and socially, it is easy to become negative and insecure.
One way to maintain your self worth is to record your achievements. Record them in a way that is easy to do: take photos on your phone or make a list (I have a 'notes' app on my phone). Seems quite obvious really but it's a simple way to remind yourself that you have done something or contributed something to life in general. I have a few photo albums on my Facebook page - one for knitting, one for graphic stuff, one for pets etc.. And I also use the NOTES section on my Facebook page (I changed the privacy so only I can see them).
Maybe in the past, cleaning the house wasn't something that you would have normally registered on your list of achievements. But it really does help. And if it's cost you a spoon, (see blog post 'I'm a Spoonie') then it's even more important you acknowledge the effort and the result of the activity. :)