anyone else find you get 'stressed' going out in public

i have an anxiety disorder and i feel a lot calmer and happier when i'm indoors, when i have to go out my anxiety levels are sky high, i'm full of nerves...even though i live in an okay area...its just being around a lot of people and noisy traffic which trigger me....my anxiety is related to ptsd.......my blood pressure has been high on two occasions when nurses tested it...so i have to have a 24hr blood pressure monitor on next week.

anyone got any tips on how i can calm down and relax or just knows what i'm talking about?