Hi Kapaalini
Welcome to NeuroTalk - I hope that you find the community as knowledgeable and supportive as I have

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Apart from the excellent suggestions that Skeezyks has made, involuntary body movements are a known side-effect of chickenpox. This case report might help you in talking about this with your health care team
Myoclonus complicating chickenpox: A case report - MDS Abstracts.
All the best.