Move on & walk away mostly. I had time off for stress related problems, I changed my shift pattern and my attiude otherwise my health inc. mental health would have become a real issue. Tensions still often run high in work and arguments will errupt but I just walk away from it.
In regards to consumer issues I tend to know how to complain (in a nice manor, without yelling or swearing) and I always choose my supplier based on how good their service is... sometimes this costs me more for the goods but I don't need agro. Other times I will just toss the item and replace it.