Hey, if you've found it's bad for you, then by all means don't consume it! The nice thing about sweeteners, unlike a lot of other food stuff, is that there's a lot of options out there.
Yes, I know this. However you're making the blanket statement that it's harmless, and I simply have to push back on that. If it affected me this negatively, it's surely causing harm to others.
"...but I wouldn't say lactose is anything but generally harmless."
Obviously you've never lain (I cannot call it sleep) with a lactose-intolerant SO after an evening of milk-laden feasting (loves Indian desserts which, with Indian meal included, ratchets up the noxious undercover methane emissions by about 10,000%). The dog even moved out of the bedroom!8-((