Its because opiates/opiods make people in general feel so good at some point during using choice of substance, that any static, and or bad noise have you interupts that pleasure, and you begin to become aggravated, and easily agitated!
It is a side effect also from opiates, this has been known for sometime, and is something your doctor should have discussed with you, also you can discuss this with your doctor, and work also on blood pressure and what your triggers are, also a good diet makes a world of a difference.
Clonidine can be useful, also benzos could possibly be prescribed but be wise take as little as possible and as directed or you could end up with a nasty lil habit.
im currently addicted to benzos (Xanax)
I am clean from heroin thanks to buprenorphine (Suboxone).
But back to topic yes opiates/opiods will cause agitation, this may be a side effect with prescription opiate medication, and almost always with heroin.
Peace
¤~¤ instead of a needle pick up a joint ¤~¤
Marijuana is a gift