Wow! I relate so much. I suffer from GAD (generalized anxiety disorder) coupled with OCD. In my youth too there was no diagnosis for it, and my father found me rather strange. I am a film editor, a creative like yourself. I too shy away from the crowds as the onslaught on the senses can be overwhelming. I very much like how you described it, as bullets being fired at you. I think we are blessed and cursed at the time. Our super sensitivity makes us great intuitive and creative people, able to focus on something for hours on end. The other side of the coin is exhausting ourselves by overthinking,analysing,projecting into the future and examining the past. I like listening to Eckhart Tolle and practicing as you said, being present. Your work is beautiful btw. Great to meet a kindred spirit. I will follow you. All the best.