If you scroll down and read my post Anatomy of a Chase, and replace "Connecticut's first Lapwing" with "Pennsylvania's first Anna's Hummingbird," "missed it by 5 minutes" with "missed it by 15 minutes," and cross out any mention of consolation birds, you have today's birding almost exactly. No need for me to write another painful post.
*side note- dipping, for those of you who may not know, is birder slang for looking for a previously reported rare bird ("twitching") and not finding it. It is not usually very fun.