I had horner's syndrome with no treatment will it go away i am very scared?

Research yourself: These is no easy answer to your question. Study the issues (e,g, http://en.wikipedia.org/wiki/Horner's_syndrome), work at understanding & learning, as you own medical decision maker (physician if you will), as you always are because you have the most vested interest & find help worthy of your trust. Others, sometimes helpful, always bring their own biases/choices, not always in your best interest