Hi Sarah,
Welcome, glad you found this board. It's really helpful when you find other people who can understand what you are going through.
I get a lot of hypochondria too - and it's just awful.
Have you talked to a doctor about trying any medications ? Just wondering, since you didn't mention that. Some people here report that they are very helpful.
I know that it stinks, and it's so unfair that we have to feel like this.
My first anxiety issues showed up when I was about your age - and then they went away for quite a long time. Then they creeped back into my life last year. It's a strange illness, indeed.
We can just do our best to seek out things that can help (counseling, books, medications, support at places like this......). People who do not suffer from this have a hard time understanding what it is like!!
Anyway - just wanted to welcome you & let you know that you are not alone.
Take care & hugs to ya!