Susan
I recommend that you take her to a neurologist. Let your daughter describe to the Doctor the feelings that she has been feeling. One thing that you may do is to keep some kind of record as to how long these periods are lasting, do you see your daughter when she is having this feeling, what is she doing, as well as how far apart are they happening. Example meaning are they occuring a week apart from each other or weeks apart. I would be very interested in knowing what he says.