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.
Lottabody texturizing setting lotion, extra body formula. For maximum body, use Lottabody Texturizing Setting Lotion, Extra Body formula to create a firm hold, that is easy to comb and results in a silky smooth glossy set.
Let the dye set. How long you should leave it in for will vary by brand, but 30 minutes to an hour is typical. Unlike permanent dyes, which contain harsh chemicals that can damage your hair and skin, there is usually no too long with semi-permanent colors. If you want to leave your work area while the dye sets, put your hair in a shower cap to keep from making a mess.