As noted elsewhere, you should speak to an employment attorney ASAP.
The general response is "probably, if you want them to address the issue." Think of it this way:
You can keep your information private. You can demand that your employer accommodate your medical conditions, if you'd like.
But you can't generally do both, because they are allowed (or required) to understand your condition in order to accommodate you.
Go see a lawyer.
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They need you to sign the paper in order to obtain the records under HIPAA laws. 40 hours are a typical work week. Are they forcing overtime on you?
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