I had to laugh when I read that you had called in sick as it reminded me of what I did a few years ago. I was too sick to go in to work so I called in and told them that my mother had died, they offered me their condolences, and told me not to worry about work.
A couple of weeks later I had to call in sick again as I was too drunk to make it in. They asked me the reason and, forgetting my previous excuse, I told them that my mother had died!!
My contract of employment was terminated not soon after!
We really are a sorry lot when we're drunk aren't we. Is there a pattern to your picking up. Are the thoughts / moods preceding it similar? Can you identify a trigger?
Often mine was either being too happy and cocky, or too depressed. Being Bi Polar that's a bit of a bugger.