severe anxiety

I used to have a very similar problem with anxiety and it is difficult to make other people understand how you feel and that intellectually you know there is no "reason" for it, but it still happens.

Have your doctor check your iron levels. I had been staving off my anxiety with high potentcy B-Complex vitamins, with added sub-lingual B-12 for years. After finding out that I was anemic and needed iron, I have improved. In addition to the iron, I also am taking about 4,000 iu/day of vitamin D. You can get all these at most grocery stores or local health-food/vitamin stores.

Try the above, but don't take too much iron without a doctor's guidance as it can be toxic. If your doctor doesn't find you anemic, you might try a multivitamin/mineral formula with iron, like Geratol. Also, eliminate caffeine and go easy on the refined sugar for a while. Sometimes hypoglycemic attacks can feel like anxiety/panic attacks too. Exercise can help alleviate stress and getting enough sleep can help too.

Try all of these at once. After years and years of anxiety problems, it is good to finally feel okay. I have been over the anxiety problem for a couple of years now and it's great.