Agreed, Happy:
Just now saw your post. Your points are valid and well-taken. I have known individuals whose personalities have done a 180 degree turn for reasons you've alluded to. Thank you for the reminder.
I now recall my dad, though of general cheerful mien, would experience mood swings due to an imbalance in his chemistry [life-long, incurable disease]. When the requisite, life-sustaining medication went to work and balance was once again achieved, he was his happy self.
Thanks for your input,
CoCo