Case of the Mondays, or just a bad day?

I dont know what is going on with me today. I woke up on time, taught my 6am Group Power class, left the gym feeling tired but glad to have a workout under my belt, and felt ready to take on the day. Then, somehow things went haywire. Traffic driving home was awful (as it usually is) but it made me late getting back to Carrboro from Raleigh. I can normally catch the 7:45 bus to UNC but today I was barely out of Raleigh by then. In my head, i kept saying "ill catch the 8" but sure enough 8am came and went and i was still miles out from the apartment. I changed my tune to "ill catch the 8:15" knowing that the 8:15 bus was my only option to get to work by 8:30, even though i still needed to change out of my gym clothes and freshen up. I made it back to rock creek at 8:13 and if i had sprinted to the bus i probably would have made it. However, thanks to my 15 mile run yesterday, my left foot is throbbing and my knee is stiff and i am hobbling along like a child taking its first steps. Looking at my watch while still in the parking lot, i accept defeat as a wave of anger and frustration washes over me. My mind is racing thinking "how can i get to work on time?" "should i just wait for the 8:30 and face being late?" "do i go home and change?" "god damnit my foot hurts!" with this rapid conversation going on in my head, the knots in my stomach get tighter, the anxiety on my skin thickens, and i end up throwing in the towel and calling in sick. I know its a cop out, my head was not in the game this morning. Maybe its hormones, maybe its lack of sleep, or maybe i let my anxiety get the best of me. Whatever it was, i crawled back into bed and have been a sack of lazy bones all day. Maybe the reason i feel so down today is because i havent done anything, but all i want to do is stay in bed and cry. I could blame the rain, or the traffic, or my foot, but it doesnt help the fact that i feel sad.  I feel lonely but yet i dont want to be around anyone. I feel unproductive but yet i dont want to do anything. If this is what having a case of the mondays feels like, then ive got it bad.