Avenged Sevenfold concert cancelled?!?!?

OK so i was supposed to see Avenged Sevenfold in concert TONIGHT at Rams Head Live in Baltimore, MD. It is their only scheduled US tour date and is COMPLETELY sold out. But apparently the lead singer has a m on his vocal chords and it got irritated so they have to surgically remove it. So I get to the venue and I see a sign on the door that says concert postponed due to illness. After driving and hour and a half. So with his surgery and recovery it will be like November-December when they will actually have the concert. Anyone else in my situation and is pissed and sad? I wanted to see them so bad. I just had to rant. Ha ha