I struggled for years with anxiety and depression. I can't say I know exactly how you are feeling and what specific things are making you anxious, but I can say I know that out-of-control and helpless feeling that happens.
I'm not suggesting that meds are the complete answer, but they have certainly helped me. I'm on anafranil and seroquel. Without them my mind would "work overtime" a my dad would say. Now I sleep better and I'm not plagued by all those awful "what if" thoughts.
Something else that helped was to expand my circle of a support group. I don't mean a sit-down talking therapy session, but spending time one on one with girls at church my age who were willing to be there for me even if they didn't understand. In some ways it's nice to have people who don't have to deal with CF themselves, because then it doesn't turn into a competitive thing. (That sounds odd, I know, but believe me...it's sometimes hard to have friends with chronic illness.)
You are doing the right thing in sharing yourself with us. I know that alone is sort of an anxious thing. I hope and pray that you'll find a good solution for whatever is going on in your life. Please feel free to PM me any time if you want more information about how my therapy and meds are going for the anxiety.
{hugs}