Baby jerks and squints her eyes alot

My daughter is almost 7 months old and today it just started that she has been jerking and wincing or squinting her eyes alot. Today she ended up spitting up at brookeshires and jerking around. Then at dairy queen, she did the same thing but not spitting up. She's been doing it still but no spitting up. She's going to the doctors today at 3:45 so I'm not just gonna wait around and see if she gets better.