@Estrellente
I suspect coffee does not agree with you. I have no experience of the dizziness thing, but some people get "the shakes" or sleep badly from taking too much.
Try a decaffeinated ground coffee for a couple of weeks, see if that suits. Oddly, dark, Italian blends taste stronger, but have less caffeine because it burns away during the prolongued roast.
Coffeemakers usually come with a measure that is nominally one cup's worth. I think it is one Espresso cup, and if you prefer a larger cup or mug, you will either use more, or it will be weaker.
I occasionally have café au lait in a breakfast bowl, which is basically half a pint of hot milk with a dash of coffee in it, so not very strong, and tastes quite different.
If you want intensity of flavour, try a small (demi-tasse) cup with no milk or sugar. Cream, and full-cream milk, suppress the taste. Semi skimmed is acceptable.
A restaurant trick is to serve little jugs of single cream with after dinner coffee. This hides the taste so you don't realise it is stale, bitter old stuff that they have reheated or kept on the hotplate for a couple of hours. It will also conceal strong instant coffee that they have made in a coffee pot and left for a few minutes to develop some taste.