Anxiety: can't organize oneself, and can't leave the house

Does anyone else experience this? The anxiety grips the mind, and the prospect of going out, beyond the comfort of the home, is terrifying, particularly where there are lots of people. Some days I can cope really well with this, while on other days it takes ages to summon the mental energy to face my fears. And then I feel bad and demoralized, particularly if I am prevented from doing something important, like my voluntary work. But the anxiety is so strong that my free will is massively constrained, and I can't see beyond my anxiety.