It's hard to tell whether it's the med, the anxiety, or maybe even some depression causing your anger issues. When I'm feeling depressed (more than anxious), I'm also very short-tempered, impatient, moody, etc. Depression commonly accompanies anxiety as well. That may be something to look into.
Do you have a lack of motivation? Do you not get much enjoyment out of things that would typically make you happy? Sleep disturbances (too much, not enough?