Hello there, i would like to add that i developed strong anxiety in the similar way you did, and i belive that some events are just the triggers for some fears and anxieties that were building up in us trough years, but nevertheless  i’ve also had crippled anxiety about everything like going to store, or even going out of the appartment, i was scared to be around people, especially when i needed to talk to someone as you said, my voice was shaky, my posture was like a weeping willow, i felt petrified like 50 times a day literally when i had to go to college , or market…first thing that helped me loosen my anxiety was jogging…i started runing every morning (i pushed my self, didnt have the will to do so but i did), first trough the woods, i was too anxious to run anywhere where the people may see me…but i general, some kind of physical activity, , you may choose yours but something that  will pump your blood, fill your lungs with air….it helps to loosen the physical symptoms of anxiety, that tightness in chest, shakiness all around the body. Second thing i did and still doing is devoting 10 minutes in the morning where i write down 3-5 things that im gratefull for, and think about them, think about why im a gratefull for those things, moments, blessings that i have, therefore you shift your focus on the good things about your life and yourself and no doubt you have them…and one more thing im also doing and thats helping me is trying too look at my thoughs from a 3rd person perspective, i dont know if i wrote it right,  but its like you are observing someone else and you can hear their thoughts, no judgging, not answering on why’s or when’s, just letting the movie in the head play , and you just observe it…that are some of my ways that i battled my worse anxieties and that i still use..i belive that you’ll find what suits you the most, and continue to live your life fearlessly .