Feeling exhausted after Constantly getting corrected at work

Getting exhausted at work. It's just 2 hrs into logging and i am already feeling tried.First they hired me for A role but I got assigned to a different role due to lack of projects. When i told the Manager(foreigner ) that i have never worked on this before , he said that i need to learn and do it.

I am getting 15+ comments on a single task which I worked on for one week.. Then after making changes I was again grilled for explaining why i had made the changes.