Yes. Yes. But an exam by s physician is needed.
No. Night sweats around period is fairly common in women in forties. It is not premature menpause but does signal hormonal imbalnce. Please see your gynecologist and they can do further w/up and blood tests.
Not neessary. Night sweats can occur in normal menstrual cycles. There are tests, such as follicular stimulating hormone, inhibin, anti-mullarian hormone, etc., to evaluate your hormone status, but are usually not necessay.