Laurie? Jen? What do you think of this? Horsey question.

Hi!
Hope you are doing well. I need more horse posts! LOL Hope to see something on the girls soon!

Today I went out to see Lacy. I'd put a few carrots in her feed bucket and was washing her halter, etc. She came over to me and after a little bit of rubbing her, she started to do what at first I thought was choking. No noise, but her mouth opened up real wide, tongue out, and her eye rolled back. She did it several times, 5 or 6, and then seemed herself again. What was that???? I've never seen any horse do it -not that I've been around them much-but I am about to call her vet. She was not doing it anymore when I left, but she looked at me like "don't leave me!" (probably because of Sterling the 2 year old) but just in case.....