Underestimating the Bug is a phenomenon where you think you've got it all figured out, but really you just have a few minor details wrong.
It's like trying to catch a greased-up eel, but instead of getting wet, you just get confused.
Cry. Just cry. It's okay, it's a process.
Take a deep breath, and try not to get your feelings hurt.
Overthinking the Bug may be the next step. Or maybe not.
Bugging Out might be a viable alternative.