I took a Tramacet tablet at about 11AM. About 2 hours later, an intense bout of nausea hit me, I then threw up and the nausea went away. I was shaking a lot and my lips were shivering, I was extremely pale and I was sweating profusely everywhere. I ate a slice of toast and lay down, the sweating stopped. It's about 2PM now and I'm incredibly dizzy and I feel faint, also my heartbeat is really soft and hard to feel.

Are these just side effects or should I be concerned?