^Well if it's all in our heads, then why do certain substances worsen anxiety and others relieve it?

Caffeine and sugar turn me into a nervous wreck, for example
I've been on and off benzos for years as well for social anxiety and panic attacks. I'm not on any right now cause i can't afford it, so i just avoid people and going out as much as possible.. which means i don't even have a job right now. Some days are better than others, but i just hate dealing with people. It stresses me out to the point that i'm completely burnt out after spending the day out on the town or working with them
When on benzos, however, i can think objectively, get business done and not feel disoriented or black out when i'm at the store. I lead a healthy lifestyle - eat well, exercise and take supplements to keep my anxiety to a minimum.. so at least in my case, the anxiety is mainly neurological. Life is ok tho, and i'll be ok. It's just hard sometimes