Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

i sometimes get de-caf but usually i order a "weak skim latte" and sometimes they say "half strength?" which i am happy with. i adore my coffee and love the brands i consume at my favourite cafes so this seems to work for me.
just make sure you drink water if you are a coffee drinker, for it can be dehydrating :-)
You can always try focusing on your work and relationships with other coworkers as well.
The symptoms are probably anxiety (fight or flight) related.
What you want is for the tension to decrease in the workplace.
Is there anything specific in the workplace that changed because you were gone or while you were gone that could be affecting the boss's reaction?
I hope you are having a better day today!