Which sickness symptom is usually the worse for you? (Headache, sore throat etc)?

I have to say it would be nausea and vomiting for me. Every time I get sick, even the common cold, I throw up violently. It's just something that happens to me. I end up losing five pounds for five days of sickness. It sucks. I hate the feeling of being nauseous. It ruins your whole day.