I feel for you as I am stuck at my desk most of the day as well. I have my stand-up desk which I try to keep up at least half the day and I've started doing leg lifts while typing. I have to get back to using MyFitnessPall to track intake of food. I also use a fitbit but it is only set to 6000 steps a day so I should probably ramp that up.
When I was pre-op and had trouble getting out to exercise due to some other health issues, I used dvds and downloads from chairdancingfitness.com (video samples link) to help me get a few minutes in at work and I still use her workouts. I downloaded a couple of her videos from my Amazon.com account so I have them accessible on my phone. I also purchased some of her slimbell weights (3 and 2 pounds) so I keep them at my desk and either mix/match weights depending on the exercise. I emailed their customer service a lot and got to know them so they gave me a discount code that doesn't expire that is 25% off products - MYPAL25
Hope this helps. We're all in this together!