It isn't uncommon for a person to come to a bit of a stand-still with weight-loss, as they near their goal weight.
Below are some links you may find helpful in kickstarting: www.sparkpeople.com/resource/fitness_artic
I hope that they don't overwhelm you - LOL!
Perhaps you could use some of your 'work time' to get snippets of exercise in. Walk to the water cooler a bit more often, and make some loo trips more frequently. Who is going to check whether you really need it or not? During your lunch break are you able to go for a 10 minute walk? It is possible (probable) that you are just plain working too long! When I was working 7 days/week, (but 5 were full days, and the week-ends were morning and night for an hour or two each) my weight steadily went up. I had a very physical job. My Dietitian told me it wasn't uncommon in those circumstances, even when we are eating properly, as I was. I know that when I stopped work for a couple months, the weight fell off, and yet I never changed my food consumption at all.