Frustration is normal,Doms and subs alike have that feeling for various reason and both participants need to work on satisfying frustrations through questioning each other,how else can you learn.?..Anger however is another matter...Anger has no place in a doms life,it creates fear in the subs life and that creates resentment,distrust and doubt..Anger also can create an unsafe enviroment and that is the ultimate No..No...Both of you must step out side your roles for a few moments and find the trigger that fires the anger and the doms resposibility is to control it...Its been said earlier in this post and its very true...If you cant control yourself,how can you control your sub...An angry dom is not a dom but a "Bully"...