I'm visibly irritated at work
Why are you irritated at work?
Because that damned co-worker was too loud talking on her phone all this time.
When you are at work you are expected to be working and not making private phone calls. You cannot be expected to work with distractions that are non work related.
I'm stressed because I'm too tired at work and I got tired of listening to her stupid conversation.
I get that she's annoying you and that's understandable, but you also need to start getting more rest if you feel this irritated at work.