Last night just after dinner I was listening to someone talk when suddenly I was overcome with nausea. I ignored it thinking "it mustn't be nausea, there's no reason I should be sick" but it continued to come on overwhelmingly strong. This is all in the space of about 30 seconds. As the nausea came on stronger, my vision started to blur and I felt a hot flush pass down my body and arms to the tips of my fingers. At that point, I felt like I was going to fall over so I stopped the conversation and sat down.
I was given some water and a spoonful of sugar and within 1 minute I felt OK again. I went to lie down and although I felt a bit weak, I was otherwise OK for the rest of the night. After I fell asleep, I woke up once or twice through the night feeling too hot, but it passed quickly, possibly another flush.
I've never feinted before in my life, so I don't know if I was "almost" going to feint. I would assume not, since I had just eaten a good full meal and had eaten well the entire day. The weather inside was very comfortable (about 24deg C and 65-70% humidity). I had consumed about 1 pint of 5% alcohol beer over the previous 2 hours which is not very much for me.
I had my blood pressure and pulse taken about 1 minute after this happened, as there was a machine sitting right there. My blood pressure was 60 over 99 which I'm told is too low and my pulse was 70bpm.
I have never had any symptoms like this ever before in my life. I was especially surprised to feel fine, then extremely nauseous and feverish, then fine again in such a short period of time (1-2 minutes).
I'm a pretty healthy, 29-year-old man about 70kg and 6 feet tall. I don't eat junk and my diet and exercise routine has not changed. The only thing I've done differently is started back at work 2 days ago so I have seen a little less sunlight and been under a bit more stress. While I do work a stressful job, I really wasn't thinking about work in the slightest when this happened.
I've done some searching but have had no luck figuring out what this may have been. I'm going to get a blood test and a check-up next week, but I'd be interested to hear from anyone who thinks they might know what this is.