An AWFUL VERY BAD DAY

oh boy today was one of those days where you look at your kid and say "REALLY? Is this my kid? It can't be my kid!" We made the mistake of passing by the electronics department at walmart and he found an MP3 player he wanted-but they were out of the two that were priced the most "kid friendly".Meltdown over that-right in the middle of the store.I had an appointment with my neice to cut his hair this afternoon.We get there and he's bouncing off the walls in the salon while she's finishing another customer--a quite well behaved little boy I might add.When it's his turn,he just freaks out in the chair literally screaming and causing quite a scene in salon-right in the middle of the mall.I pay her the full price and got him out as quickly as I could.She is graciously coming over to our house tomorrow on her day off to finish cutting his hair for us.She said we wouldn't owe her anything but I'm going to pay her something anyway.These past few weeks it just seems like he's so EMOTIOINAL and WHINEY and just UNREAL that I don't know what to do.I am at my wits end.I've tried being more stern in our punishment.I've tried being less stern.I just don't know what to do.We have had him tested for the dreaded ADD/ADHD and even autism.They said he didn't fit all the symptoms for either.I am soooo stressed!