I find that getting grounded and 'back in my body' gets me out of my overactive brain
Yoga and breathing exercises work best for me, I feel calmer and more in the present when I do these regularly. If I really seriously need to get something out I write it all down instead. Just let it all spill on to the paper and see if it clarifies anything for me... then let it go.

Probably good to give the counsellor a chance as Kazbah suggested too. Great that you are going - anxiety can be so draining!
OH just realised last post on this was in August!! You can tell I haven't been on this forum before Hope it went well for you anyway Connie (and congrats on your BFP!!!!).