My dry skin became an combination-oil slick when I got CRPS too. For the last six months I've been wearing Diorskin Nude Glow. It costs an arm and a leg ($47 CAD), but it's the only foundation (yes I've tried MAC and Makeup Forever) that stays on all day and looks fabulous all day long. A little goes a long way. It's medium to full coverage and buildible, has a glow but no sheen so you won't shine. I top it off with a dusting of my lifesaving MAC Blot Powder, designed to suck up oil. You can get a sample from the Dior counter to try.
Good luck