Female 77, having some of the same issues. I am hypothyroid and feel my sweating and hot flashes are due to this, my difference is, sweating from my head like I have had a shower and did not dry off. It is so embarrassing, can happen any time. Kids in my SS class have asked me "are you okay" so if is visible to others. I can tell when is is starting, I get hot all over unlike you and your core feeling. I have been told I have broken my internal thermometer, where ever that is located.