Hi Lisa and welcome to the boards!!
Sorry I wasn't around sooner to reply to your posts, it's been a crazy week to say the least! But you will find that these boards are a great place for love and support from people who know what you're going through!! I love it here, it's so reassuring to have people understand you (whereas most of the people in my life just don't get it)
Changing moods is a sign of an ED, because, as I"m sure you know, ED's aren't completely about food. They're a mental game of fighting the demons in your head for control over your life! So as for waivering back and forth about whether or not you think you're sick, I can relate. I STILL do that. VERY VERY few people know about my ED, and some days I just want to tell everybody so they understand how sick I really am...but then other days I'm like "Oh, i'm just being melodramatic, I have this under control." You have to realize that this is the ED talking...if you think you need help, you deserve it and you should get it!
Have you told your mom about your problem THIS time? It might help. The more love and support you can get, the better it will be!!

This is nothing to be embarrassed about, it's a problem and you deserve help just like everybody else who has problems...
Good luck, and please let us know how you're doing! You can do this, you deserve a happy "ED-free" life!!
NEVER GIVE UP
~sarah~