OMG!! That is a happy baby! I love baby pictures!
You do need to be seen by a specialist. I know it's hard to be patient, but a 2 week wait isn't that bad. Think of it this way: waiting those two weeks isn't putting you behind in treating it, whether it's a PWS or a stork bite. It's giving you time to become informed and learn what questions you need answered either way. So, try hard not to be nervous.
Other parents will come in soon and back me up on that! Honestly, I was thinking of telling you to go take a nice long bubble bath, but didn't want to sound like I was making light of your nervousness. But the more I think about it, the better it sounds. Take a good break and get away and treat yourself to a little something.