As a sometime writer, I often have to transcribe interviews. It ain't easy, is it!?
My advice is to find a player (computer program) that can play back the file at variable speed. Slow it down and use headphones to hear better and give you two hands to type with. Just type as much as you can (in a separate text editor, not Word since it will autocorrect) as fast as you can, hit pause when you need to catch up, and go back over to fill in. Speed it up to go over the parts you don't need.
You shouldn't have that much stopping and starting that way.
Another way is to hear one sentence, pause, repeat it over and over until you finish typing it. Then same thing with the next sentence.