Responsibility without authority or support

A few years ago I was asked to take on the role of training new hires. I had been establishing protocols (as everyone was doing their own thing) and this was strongly supported by management. Since then, there have been several problems with others undermining me in training with mid-management telling trainees they don’t have to follow my instructions and new people coming in wanting to changes processes to what they were used to in former jobs. Now management is supporting probationary staff in changing processes without any discussion beyond that person which is significantly impacting the workplace. I can appreciate that it is challenging to come into a new work place and having to learn new processes, but it is also offensive to have someone brand new and less experienced change processes with management’s blessing and no team discussion. The worst part is the lack of respect for my knowledge in essentially being told the processes I have worked very hard to put in place don’t matter and staff doing their own thing is okay. I feel very frustrated in that I cannot help management to see that consistency in how we do things is important both for covering other’s work and training and ensuring that we are in compliance with professional requirements. At this point, I need to stop caring but that is difficult for me. In addition, I am often the one called upon to fix problems that occur and lately, that is all I have been doing. A job I once loved is now a job that I am growing to hate. Although we are to function as a team, it seems to be that we now just do things the way we want, and oh well. I feel as if I have been demoted without being told I have been demoted. I feel it is time for me to quit this job.