In reply to your question regarding your hands and feet and your increase sweating. You appear to have the condition Raynauds or a form of given the mechanism is not typically the same as the more common form of Raynuads which you describe.
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I really want to say as soon as you feel like it. When my hair feels too flat, I shampoo it 2 days later and rollerset it. If I paid a grip at the salon, I try to make it last a week just to get my money's worth, but the relaxer won't wash out or anything. If I'm wrong, maybe a licensed stylist or someone else can correct me.