Overreacting or is this normal?

My daughter is EBF and she will be a month old on July 7th. Everytime she eats, she will unlatch & gasp for air. She coughs just to catch her breath and then cries because I guess it scares her. I don't know if I have a fast letdown that makes her choke and takes her breath or if her sphincter that separates her stomach/lungs isn't properly working. I am scared she is going to choke one day and not catch her breath back. This happens at every feeding. Please help!