My manager

I am so over my manager…. I literally worked an increasingly busy period with a cover manager who micromanaged me (mind you I was given new jobs to do which increased my workload, i haven’t even done the role for a year). I did all I could to manage and set up new ways to manage my tasks, my manager returned after a 1month + holiday and literally didn’t even acknowledge me.
I am his only worker, not one thank you. Not one how are you. He went back to giving me work instructions. Alright yes we are at work but like I’m here 5 days a week, like am I just a robot to you(probably).