Emotions are a result of the activities inside your brain. Each one has a special meaning and they are meant to give you feedback as to what is happening now. They are real and I think trying to avoid them is not the most efficient use of them.
Frustration, in my experience, is a sign of change. Change is taking place, but it is not complete yet. If you give up at this stage, change will stop and the pattern you are trying to change will take over again. Take your time, change takes time, but don't give up.
All the best