I have severe anxiety as well but have really overcome it to a huge extent by constant studying of subjects I loved (ancient civilizations and their spiritual beliefs and practices as well as the cosmos as it tends to tie in among a few other topics that tie in as well). After many years of studying the anxious part of my brain turned into a meditative and contemplative part of thinking instead. My anxiety was cast aside and it is like I can hold a meditation while thinking about regular subjects. Very strange but lifesaving for me.