Nikki , yes there is a way we can control our thinking. It's called Cognative behavioural Therapy (CBT).
Here is a link if you wish to try CBT
I went through three different inhalers before I realised it wasn't asthma........this was also the second time I was diagnosed with it , the first was when I was very young...I wonder if this was A/P aswell , a lot of ppl have said that they can remember being anxious when they were young.
Please do give effexor a go - don't read up on things as it will just make your anxiety worse....you know that anyway don't you just tell your doc if you get any symptoms or experience something out of the ordinary.
I hope everything goes well for you ,
DX : Bipolar , Panic Disorder , GAD , OCD , IBS.