I tend to confuse things b/c we have to avoid more than most, so I'll try to reply to you and be very obvious about what is HFCS and what is the extra stuff.
HFCS also goes by "glucose-fructose syrup", and Blue Sky even calls it "high fructose corn sweetener". There's a possibility that "glucose syrup" is HFCS, but when I looked it up I only saw it linked to plain old corn syrup.
The extras that we have to avoid, along with HFCS, are regular corn syrup, and corn syrup solids. For us, it's possible that cornstarch and even dextrose (which is a sugar that comes from corn) should be avoided. We are lucky that powdered sugar doesn't cause issues, b/c it is "cut" with cornstarch. But DS doesn't react to that, thank goodness, b/c we let restaurants put that on pancakes and waffles when we can't use their pseudo-maple syrup. It's even possible DS should avoid corn altogether, but he's not willing to eat corn anymore to test it. He hates his "dragon" episodes and is willing to give up *anything* to avoid them, even though he's not even 4.
Watch out for the extracts, by the way, in case you do much baking. The artificial ones tend to have HFCS, and even a better, real vanilla and almond that I found had corn syrup in them. So now I have to buy the spendy organic extracts, to make sure they don't have crazy-making ingredients.
Corn is a toughie for sensitivities! Even before DS arrived I knew about it (why it took me over 3 years to figure it out is beyond me), because my best friend's good friend has 3 daughters. They are ALL, including the mom, sensitive to corn (and wheat, gluten, and some other things, which cause them physical distress). When they have corn, they behave in out of control ways. The oldest girl has a diagnosis of ADHD, and the others would, if they were given corn. The mom is similar. When they don't have corn, all but the oldest are fine (and the oldest's ADHD behaviours are far worse when she has corn).
Avoiding corn products is a PAIN. So if you can get things under control by just avoiding HFCS, I am glad for you! The "kid" foods at Disney are not allowed for DS b/c of the three big ones he has to avoid. (Uncrustables have HFCS, by the way) Most ice creams, BREAD, just all sorts of things have HFCS and the others in them... We actually eat mainly organic (while checking labels to make sure), because it makes it much easier to avoid them.
Good luck!!!!