There are a lot of unsubstantiated claims that sugar substitutes and sweeteners are bad for you in this thread.
backed up by reasons such as 'they have a lot of syllables' and then some personal anecdotes thrown in to really sell it.
I have not seen any evidence that artificial sweeteners are harmful to health, and even the claim that they might lead to overeating to compensate for the zero calories is inconclusive at this point.
You go for it OP, don't let the FUD get to you, it's just people using the naturalistic fallacy.
While I agree that there is no scientific evidence showing negative effects from consuming artificial sweeteners, that doesn't mean anecdotes from people who have reactions to these chemical are lies. It simply means we don't have scientific explanation for them yet.
Take these anecdotes with skepticism if you will and feel free to consume sugar-free drink to your desire. Just keep in mind that if you happen to have negative side effects from it, you're not alone.