Do sugar free energy drinks have some other wacky shit in them?

[6ft4]

In recent times, I've gotten anxiety whenever I've drank energy drinks and I always drink the sugar free ones
Today I just had the regular sugar one, with same caffeine content and I got no anxiety from it
Coincidence or is there some weird shit in the sugar free ones I'm reacting to?

 

[aBetterMii]

They make them sweet with aritifical sweetners which are worse for you than sugar in most cases

 

[zharupodrugu]

They add some nasty shit to make it sugar free and tasty at the same time. I would avoid to put any unknown shit in my mouth.

 

[Yliaster]

idk why ppl waste $ on energy drinks tbh,just invest in a preworkout and pour a scoop in a bottle of water
whenever you need to perk up during the day,works great for me and saves money