Developed anxiety

I'm unsure what to say, so I just tell what happened recently.

I started to develope anxiety attacks one year ago. I realized that it's more then just shyness as my whole body started to shake and I couldn't think straight anymore. My heart was pounding so fast and I felt dizzy. I didn't even do anything special, I just gifted someone I saw as a "friend" something to cheer them up/make them happy. I was so anxious cuz I didn't know how they would react, I couldn't imagen it. I'm always shy and feel stressed whenever I interact with someone, but this strong reaction was new to me. I didn't told anyone about this and just brushed it off, but it keeps happening...