Why do I feel like I'm dying everytime I drink coffee?

I decided to buy ice coffee from dunkin donuts. Everyone seems to like it, so why not, you know? I drank the whole thing and my heart kept racing- I felt uneasy and very uncomfortable for a long period of time after drinking. I couldn't think straight.

The same thing happens to me when I drink more than one cup of coffee. Caffeine affects each person differently; age, body mass, and overall health can determine your tolerance to caffeine. Caffeine acts as a central nervous system stimulant. When it reaches your brain, the most noticeable effect is alertness. Which is why you felt uneasy and very uncomfortable. Is this your first time trying coffee? If it is, then try to limit yourself, too much coffee and cause headaches and nausea. If you already drink coffee it could be the added sugars and syrups in the iced coffee. I would recommend brewing your own coffee, not only it's cheaper but it tastes better. Here are some ways to brew coffee at home it has some good information: https://www.homegrounds.co/the-complete-guide-to-coffee-brewing-methods/