I would try this short-term:
Every time you notice yourself worrying, simply accept your worrying instead of trying to resist it. Take notice of it and it will probably pass instead of lingering and causing anxiety. If you can do this every time you notice yourself worrying, you will hopefully notice a pretty quick reduction in the severity of your anxiety and feel a lot better- when I had crippling HA a couple of months ago I was able to do this every time a worry entered my head and honestly felt considerably better about my worries within an hour or so.
You can also download an app called SAM if you have an iPhone, it's free and basically has a bunch of CBT exercises and meditative techniques, as well as lots of resources that explain how anxiety impacts on you physically and mentally and the physiological/mental functions behind it.
Best of luck