Others have already provided good answers but I feel there are some facts that need to be stated a little more forcefully. Alcohol is accepted in many societies for cultural/historical reasons (and I like it as much as the next guy) but it's pretty bad all around as far as health is concerned. Pills (at least those that are classified as medication) will have a much more controlled effect and dosage and have been evaluated for their risk/benefit balance. Do consult a doctor but as far as toxicity is concerned pills win hands down on alcohol, it's not even a close call.

And two shots of whisky an hour is really a lot. If you can walk and speak normally after a long-haul flight at this regimen, I am pretty sure you consume quite a lot of alcohol even when you're not flying and you might want to consider that this is also bad for your health.