I’ve had problems in the past similar to GAD, I know what it’s like to be constantly worrying about things.
Good to hear you’re better. The best thing I ever did for myself was to close my eyes, think of a time and place when I’m really relaxed (when I’m laying prone with a rifle at a range)…I’d go through the same process of taking a shot in my mind and would control my breathing as I would with my shooting and at the same time I would touch my trousers with my hands….focusing on the texture.
I did this enough until I could get my heart rate down simply by touching the sides of my trousers, it reduces my nerves massively and helps me to keep a cool head. I still do it sometimes at the top of downhill runs or during exams.
It’s a psychological grounding technique, google is your friend – it set off my interest in biology and medicine.