Can drinking spoiled whey protein powder mixed with water really make you physically ill?

I just drank spoiled whey protein that was pre-mixed with water. I now feel sick but I am hoping it is just in my head. Can you get seriously ill from drinking this? It was only about a cup. I didn’t realize it until it was down the hatch. I thought it tasted “funny” but when I put my nose to the bottle it smelled terrible,...clearly spoiled!