@Marcus Thanks for your reply. I appreciate what you are saying.
I am currently still experimenting to see if I can get to the bottom of this. It looks like it might not actually be the sucralose because I’ve also had headaches when consuming an alternative product that doesn’t contain sucralose. The interesting thing is, both products contain sunflower, which once showed up on a food intolerance test for me. But it could be some other factor, so I need to keep trying different things to see what happens.