How long have you suffered with anxiety, it is cyclical? Is there any particular time of day when you feel worse?
I had my first panic attack aged 3 and have suffered/struggled since. I take an anti-depressant night and monring as well as having an anti-anxiety emergency drug. In 2002 my GP prescribed Propranolol to ease the early monring surges. By evening I would be a different person as anxiety eased, I had to learn to say 'no' to anything or by morning I would be a shivering wreck

Bachs 'rescue remendy' might help you. I've used the mouth spray successfully in the past, 3 sprays onto the tongue and didn't wonder if it would/not work. Valium the night B4 events that I was unable to get out of too: 5mg the night B4 knowing that I was able to take another mid-morning which I never required.
Let us know how you get on.