Unvalidated?

I have not been on in awhile, but it has been long overdue. I recently started a new semeseter in my nursing school, and now school tkae up at least 5 days a week. This means that I can only work 2-3 days at my job.
I know that this is what needs to happen for me right now, but I am having a hard time with my job. I feel like they have already written me off as not working there anymore. I have trained three people for different parts of my job. They have shifted my job duties to mindless crap that no one cares about but needs to be done. I guess I feel unvalidated. It has been such a huge part of my life for almost 9 years now, and I feel like they are walking away on me.
What's a person to do? I know I will be done with school in about a year and leaving the company, but I don't know how to feel right now about it. Oh well time to study...