I think it really is a decision, and I really like the way you put it that way in the title.

I used to worry about everything... Shel would say "why are you worrying" and I'd reply "if I don't, who will". I thought you couldn't be prepared without worrying about something. If I didn't worry about the 'what-ifs' then I wouoldn't know what they were and I couldn't prepare for them... little did I realise that my what-ifs were so over the top they were really ridiculous. I had an anxiety disorder. But to me, even though it was seriously over the top and often debilitating anxiety, it was comforting to be anxious, because I felt prepared for things that might happen...
I really did have to make the decision to want to stop worrying. I had to be ok with not worrying. I think thats a huge thing, you can't overcome anxiety unless you really really want to stop being anxious... I had to be ok with just a little bit of worry. A normal amount of worry, as opposed to an excessive amount of worry.

That probably makes no sense but I jsut wanted to say yes it is a conscious decision.

Luckily this time I didn't need medicating, but I have been at that place in the past (pre-Jazz) and it was extremely helpful for the time I was on them, but yes you do need to do a lot of work to ensure that when you come off the medication you don't relapse. You have to be active even if you take medication. The medication isn't the treatment. You can't just take medication and think things are ok, because if you do no work while you're on it, you'll be exactly where you started when you come off them. And you'll relapse, and end up back on them. Like Kelly said, often it is a cycle...