I feel lower than dirt. Stupid and embarrassed

I go out for a month tomorrow. My boss, correctly, wants my voice message to reflect that. We have, to me, a complicated phone system. Even calling IT to reset my phone to a temporary PIN, I did not hear a prompt telling me to change my PIN. I was on my cell, talking to the tech, fiddling with the phone. I thought I changed it, but didn't when I called after work.

My boss seemed mad. I feel like a stupid idiot. There's something wrong with me. I cannot stand this type of stuff anymore. So, I screwed it up.

I was so rattled, I forgot what I needed at the store after work. I'm disassociating. I haven't felt this bad in a long time.