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I get the same thing if I take meds (eg cold or flu type) with added caffeine. Make me feel really ill palpitations, I literally have to lie down as I think I am going to die. I can drink coke, coffee, tea, no side effects at all. I just know I can't deal with whatever sort of fake caffeine they add to these things, so avoid. It should be reasonably easy to avoid glucose syrup? What is it in? I can't think of anything essential?
It might be worth getting a 24 or 48 hour halter monitor done by cardiology. I have a very rare (1/10000) heart condition which means that I get weird palpitations when I am stressed, exercise strenuously, am tired, ill or if I eat/drink anything with caffeine, chocolate, alcohol and/or other stimulants. It's called CPVT and I have a defibrillator implanted because of it. The usual symptoms are fainting during stress or exercise but I was diagnosed because I was having thousands of palpitations everyday. As I said it is very, very rare but even if you don't have the condition it may just be that your heart is 'irritable' and you need to avoid those foodstuffs.
I get similar from decongestants (the stuff that's in sudofed).
Also get very light-headed if I've not eaten for a while and then either eat something really sugary (chocolate on an empty stomach) or have something stressful happen (stressy work phonecall). I've put it down to over-sensitivity and am slightly embarrassed by it!
I get it from most forms of sugar/carbs, have been eating LCHF for about 7 months and if I eat anything sugary/carby it really makes me feel bad. I think I have IGT - impaired glucose intolerance, although am not diabetic (was tested last May), maybe an age thing as I'm almost 70. LCHF is the way to go if you can do it (bonus of weight loss as well!)