I was at a social outing tonight, and I heard a guy talking about giving blood. It made me feel nauseous, but the nausea became ridiculously intense, and I felt as though I was going to collapse, and I started hearing a buzzing sound. I thought it might be a panic attack, so I got up (which was very difficult to do) and went to the bathroom and sat on the toilet. It passed after a few minutes. I'm concerned, particularly about the buzzing sound.