You likely aren't moving about as much as 'before'. It's an issue we all have to wrestle with!
Here is a site of 'exercises' that covers the whole body...pick what you need and most of this is stuff you can do at home.
http://www.fairview.org/healthlibrar.../sma_index.htm
If you have gone thru PT before, I'll bet that lots of these are familiar. It's surprising how much good a small set of theraband exercises [you can do in your chair] can help stimulate the circulation at swelling spots. Did for me!
You can find therabands at all the 'Marts and Targets of the world. Abt $10 for 3 different resistances [I use the wimpy one myself-it's all I need]/
Hope this helps - j