Most people who work in an office all day have low Vitamin D and will benefit from taking a supplement. You don't need a prescription for it (at least not in the US) so you can just walk in and pick it up in the vitamin aisle at the grocery or wherever. Get the ones that are liquid gels as I have heard they are better. I take a Vitamin D supplement twice a day and have noticed vast improvements in feeling more healthy (in general) and being less prone to anxiety and depression (I used to be).
I don't know for sure if all of this is due to taking Vitamin D, but I believe it to be. It is such an easy thing to try and low risk (ask your doctor about it), so why not try it?
And if all of that doesn't work then find another job. Seriously, your time is too important to spend it being miserable.
I suppose cost could be a factor. Depending on what the airlines consider the value of a human life to be would determine whether this is feasible for them. It comes down to how many 9s the airlines are willing to accept and what they will pay for that "uptime" of their engines.