Thank you. I am in the exact same boat. Sometimes it will just come out of no where - and my work environment doesn't help. We are on this huge move to create "new and innovative" offices where there are no offices so everyone is just shoved around tables to chat and talk and generally be royal pains in the ***. And I get so ANGRY. So I put on head phones so I can concentrate and focus - then get yelled at for being antisocial. GAH!

However, have you tried talking to your daughter? You know you're angry - why not go talk to her - tell her it isn't her, you're just very sensitive to noise right now and you need to give her space to play and be noisy because you acknowledge she should be doing that. It might help with your guilt too.