Hello Friend, Good that you are seeking a help. Appreciate your interest to mange stress through yoga. It's a very good first step. Surely it will benefit you and continue this life long. About your anxiety at night, it still shows your are distrubed at mind and keep thinking and worrying about past. You need to control and manage these though.
Moreover , you also need to know how to handle stress and in life, as you will face many such suitations in future and you can't quit everytime. As body and mind are interlinked stress can also happen due to some physical condition in body like excess body heat, PMS, digestion issue etc. So it's important to look at a holistic approach. As I am an Psychologist and ayurveda wellness counselor, I can assess your both body and mind to recommend appropriate solution. Reach out to me online.
Health Tips
Have a warm milk before bed. Finish your dinner min 3hrs before sleep. Do a gentle coconut oil foot massage before sleep. There are few home remedies for good sleep.