Called out?
This person must have had quite a element of persuasion over you if they mentioned it and only now noticing these ticks:
For Posture: Alexander technique exercises
For Diction: Speak For Success Course
For Clothing: IOffer.com - look up: Armani suits get 3 for about 400 dollars (yes there fake but they look and feel great try to feel nervous in one of those

)
And if your really struggling try wearing shades. YES indoors at night in the winter ; women seem to dig them and nervousness in most readily communicated via eye movement. Its only temporary until you learn via experience that the worst thing that will happen if they don't go for you is NOTHING will happen good or bad your at the same place you were when you stared.
You never get rejected you only find out if the target has good taste.