Worsening of repetitive behaviors, Please Help!

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Any ideas as to what could be causing my child to get stuck on

something that elevates to a tantrum or meltdown. We have not been

chelating for about a month. She has always done this but it is

getting much worse. She wants everything we say or do and everything

she says or does to be a certain way. It's not like this all the

time, but sometimes she just gets stuck on something and can't move

on. We have to keep repeating it until she gets it exactly the way

she wants it. It's almost like she is a movie director. She gets

extemely anxious and aggitated. She gets stuck on it, can't get

beyond it, then has a meltdown. I don't think this happens at school,

but I'm afraid it will start. Could this yeast or bacteria? Thanks

for any help.