Lee,
That once was my biggest complaint, I was constantly dizzy all the time. What I realized with me was that I wasn't breathing properly, either too shallow of breathing or I tended to hold my breath when anxious. I started doing breathing exercises everyday, even when I wasn't anxious and now the dizziness is a thing of the past. This might work for you too if your breathing becomes irregular when you're anxious. I just breath in through my nose to a count of 5 or 6, hold for a couple of seconds, then breath out through pursed/tight lips to a count of 7 or 8. This helps regulate the amount of oxygen and carbon dioxide in the blood. When we are anxious we tend to overbreath and this throws off the balance of carbon dioxide and oxygen which can result in dizziness, chest pains, heart palpitations, etc. Worked for me so maybe it could work for you. Remember, it will take several days of doing this regularly before you notice any benefits. Hope it helps you :)