hhmmm this may be dietary related but am not sure. Every so often on say a weekly basis I will get extremely hot from the neck upwards and feel pretty dizzy. It's happening right now and I am at work and its not nice. It also happened last night and I felt so weird and hot I just went to bed. One night I was in bed with my girlfriend and I was shivering but from the neck upwards was roasting. She thought I was dying and then I woke up the next morning absolutely fine. Very strange. I am hoping i don't have to do anything at work and am drinking lots of water in the hope that that will help. Have a jelly in my wallet just in case for special emergencies but don't really want to do that. Any ideas peeps. I have a couple of mates with the same symptoms as well